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Jordi Fabre
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Location: Barcelona
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Posted: Jul 14, 2014 02:03 Post subject: Re: Collection of Xiao-dong |
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xdxucn wrote: | Thank you for refining the specimen info. |
Always a pleasure. Great photos!
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jul 14, 2014 02:40 Post subject: Re: Collection of Xiao-dong |
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Here's a very cute specimen. The Calcite ball was replaced by SiO2, which has Hedenbergite inclusions (the same as Prase). So, can I call it "Prase pseudomorph after Calcite"?
On the top of the ball, there's a tiny quartz, which adds some visual appeal.
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Calcite Huanggang Fe-Sn deposit (Huanggangliang Mine; Huanggang Mine), Hexigten Banner (Keshiketeng Co.), Ulanhad League (Chifeng Prefecture), Inner Mongolia Autonomous Region, China 15 x 14 x 13 mm Calcite with inclusions |
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Tobi
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Joined: 07 Apr 2009
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Location: Germany
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
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Location: Barcelona
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Posted: Jul 14, 2014 03:07 Post subject: Re: Collection of Xiao-dong |
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Are you sure is a pseudo? it seems to be a Calcite colored by inclusions of Chlorite or an Amphibole.
Have you tested the hardness? or, a separate small parcel fizz in dilute HCl or (less vigorously) in concentrate vinegar?
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jul 14, 2014 03:14 Post subject: Re: Collection of Xiao-dong |
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Jordi Fabre wrote: |
Are you sure is a pseudo? it seems to be a Calcite colored by inclusions of Chlorite or an Amphibole.
Have you tested the hardness? or, a separate small parcel fizz in dilute HCl or (less vigorously) in concentrate vinegar? |
I think I need to verify it before any conclusion. The information is from a local mineral-fans community. Thanks, Jordi.
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jul 14, 2014 06:10 Post subject: Re: Collection of Xiao-dong |
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"Faden" gypsum
At the Changsha Show this year, I luckily got one piece of phantom gypsum from a local dealer friend.
The gypsum specimen has a habit seen in faden quartz, which is amazing.
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Gypsum Weishan Co., Dali Autonomous Prefecture, Yunnan Province, China / 巍山,云南省,中国 8.5 x 3.5 x 4.5 cm "Faden" Selenite |
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Gypsum Weishan Co., Dali Autonomous Prefecture, Yunnan Province, China / 巍山,云南省,中国 8.5 x 3.5 x 4.5 cm "Faden" line can be see clearly. |
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jul 14, 2014 06:39 Post subject: Re: Collection of Xiao-dong |
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I think these 2 images show clearly what I mean for "faden gypsum".
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Gypsum Weishan Co., Dali Autonomous Prefecture, Yunnan Province, China / 巍山,云南省,中国 8 x 3 x 1 cm. (approximately) |
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Gypsum Weishan Co., Dali Autonomous Prefecture, Yunnan Province, China / 巍山,云南省,中国 8 x 3 x 1 cm. (approximately) |
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Carles Millan
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Posted: Jul 14, 2014 07:17 Post subject: Re: Collection of Xiao-dong |
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xdxucn wrote: | I think these 2 images show clearly what I mean for "faden selenite". |
Please, could you provide the size and locality of the specimen in faden-selenite.jpg and faden-selenite1.jpg? I'll make the correction for you.
Take note that selenite is not a mineral species. Your specimens should be labeled as gypsum instead.
Thanks for your excellent photos and postings. Keep going.
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jul 14, 2014 07:29 Post subject: Re: Collection of Xiao-dong |
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Carles Millan wrote: | xdxucn wrote: | I think these 2 images show clearly what I mean for "faden selenite". |
Please, could you provide the size and locality of the specimen in faden-selenite.jpg and faden-selenite1.jpg? I'll make the correction for you.
Take note that selenite is not a mineral species. Your specimens should be labeled as gypsum instead.
Thanks for your excellent photos and postings. Keep going. |
The last 2 photos are from the dealer, and for reference only. Cause I want to show more clearly the habit. The locality is the same: Weishan Co., Dali Autonomous Prefecture, Yunnan Province, China. The size can be seen only in one photo (ruler below in cm).
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
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Location: Barcelona
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Posted: Jul 14, 2014 07:55 Post subject: Re: Collection of Xiao-dong |
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Fixed everything.
Please note that in this section of "Collection photos and Collector's page" we need "IMA names" for each species, so terms like "Selenite" or "Faden" are not welcome in the "Mineral" caption's box. Of course you can use what you want in your descriptive texts (although some FMFers could disagree ;-) ;-)
Also please note that "faden quartz" is a descriptive term for a usually tabular group of quartz crystals with a white thread-like or string-like zone running through the interior. The term "faden" is a German word for "thread".
So, if you want you can use it for a Gypsum but it don't match quite well this species...
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Gerhard Niklasch
Joined: 27 Mar 2009
Posts: 134
Location: Munich
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Posted: Jul 14, 2014 08:40 Post subject: Re: Collection of Xiao-dong |
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In our original German usage, the qualifier "Faden-xxx" does not automatically imply that xxx="Quartz", although quartz is by far the most common case. (For example, epidote/clinozoisite occasionally provide other examples.) You certainly can't use "Faden" alone in German to refer to such a mineral specimen without appending a species name.
Of course, faden-type growth won't be visible unless the material is clear and transparent and, if colored, sufficiently thin; which limits the candidate species.
Here, based on the pictures, I'm happy with the appearance being described as "faden Gypsum".--
--Nice gallery, and I like the additional points of interest mentioned in the descriptions! Please do keep them coming. :)
Cheers, Gerhard
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jul 14, 2014 12:21 Post subject: Re: Collection of Xiao-dong |
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It's so nice that I could get those wrong specimen information corrected, with the help of so many experienced people in this forum. Thank you.
Another thing I'd like to correct is about "quartz10a.jpg": After consulting some more local dealers, and doing some hardness test by myself, I think that piece is "green calcite with quartz on top". Thanks to Jordi.
I'm very glad that people like these photographs. Maybe some people want to know how to get that quality. I use EOS 60D with 100mm macro lens for most mineral photography. I use simple lighting, usually just a desktop lamp, but with a professional studio bulb (5500k temperature which reflect 90% of natural color). I don't have any expensive studio equipment, background, reflection plate, etc. I might shoot mineral photos just on some white or black paper. The most trick part is to remove and replace background digitally, which benefits from my skill and knowledge in computer graphics. I'm considering writing some brief tutorial on how to do this. It might take some time because English is not my native language. When it's finished, I'll put on the forum. :)
Xiao-dong
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Jordi Fabre
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Posted: Jul 14, 2014 12:58 Post subject: Re: Collection of Xiao-dong |
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xdxucn wrote: | ...I'm considering writing some brief tutorial on how to do this. It might take some time because English is not my native language. When it's finished, I'll put on the forum. :)... |
Sounds wonderful! ;-)
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: Jul 14, 2014 14:56 Post subject: Re: Collection of Xiao-dong |
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xdxucn wrote: | ...I'm considering writing some brief tutorial on how to do this. It might take some time because English is not my native language. When it's finished, I'll put on the forum. :)... |
Look forward to seeing it
_________________ hogwild |
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jul 15, 2014 08:57 Post subject: Re: Collection of Xiao-dong |
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Glassy clear fluorite cubes with distinctive blue edges and spots on the faces. Some areas are covered with a tan coating of hemimorphite.
Interesting thing is: the blue edge can be seen from certain angle, but becomes invisible from other angles (compare image1 and image2).
Description: |
Fluorite + Hemimorphite Coldstones Quarry, Greenhow, Yorkshire, England, UK 35 x 23 x 18 mm |
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Fluorite + Hemimorphite Coldstones Quarry, Greenhow, Yorkshire, England, UK 35 x 23 x 18 mm |
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Mike Wood
Joined: 16 Dec 2010
Posts: 456
Location: Northern England
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Posted: Jul 15, 2014 12:09 Post subject: Re: Collection of Xiao-dong |
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Nice little fluorite specimen Xiao-dong! It makes a change for me to see a 'local' specimen on this site - Coldstones Quarry is only 20mins away from me! (I don't collect there as it is a large working [limestone] quarry). Nice example with the strange purple spots/edges.
Mike
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jul 15, 2014 18:26 Post subject: Re: Collection of Xiao-dong |
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A thumbnail shows interesting habit of chalcocite: a "nailhead" formed by hexagonal crystals stacking together.
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Chalcocite Cornwall, England (only general info) 22 x 13 x 11 mm |
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Chalcocite Cornwall, England (only general info) 22 x 13 x 11 mm |
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jul 16, 2014 12:37 Post subject: Re: Collection of Xiao-dong |
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Group of stibnite crystals associated with balls of siderite. Displays well from either side.
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Stibnite with Siderite Herja Mine, Chiuzbaia (Kisbánya), Baia Mare (Nagybánya), Maramures Co., Romania 7 x 5.5 x 3.5 cm |
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Stibnite with Siderite Herja Mine, Chiuzbaia (Kisbánya), Baia Mare (Nagybánya), Maramures Co., Romania 7 x 5.5 x 3.5 cm |
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jul 21, 2014 03:38 Post subject: Re: Collection of Xiao-dong |
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A piece of etched sulfur, looks like canary yellow coral. The specimen exhibits kind of dissolution to an extreme with many 'tunnels' extending deep into the sulfur and with several going all the way through.
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Sulphur Stoneco Quarry, Maybee, Monroe County, Michigan, USA 3.6 x 3 x 2.2 cm |
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Sulphur Stoneco Quarry, Maybee, Monroe County, Michigan, USA 3.6 x 3 x 2.2 cm |
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Tobi
Site Admin
Joined: 07 Apr 2009
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Location: Germany
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Posted: Jul 21, 2014 11:36 Post subject: Re: Collection of Xiao-dong |
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A really weird piece of sulfur ... looks like a bath sponge ;-)
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