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R Saunders
Joined: 28 Jul 2018
Posts: 126
Location: Michigan
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Posted: Mar 25, 2019 04:35 Post subject: Cr-rich green Tremolite |
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Cr-rich green Tremolite with lot's of stuff holding it all together. I realize this is not a lapidary forum, is it feasible to grind or ultra sonic away a lot of the matrix to improve the looks, wouldn't mind a few smaller pieces for display. Hall Farm.
Mineral: | Cr-rich green Tremolite |
Locality: | Gouverneur Marble Company Quarry, Gouverneur, St. Lawrence County, New York, USA | |
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Dimensions: | 127 mm x 101 mm x 63.5 mm |
Description: |
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Viewed: |
14860 Time(s) |
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Mineral: | Cr-rich green Tremolite |
Description: |
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Viewed: |
14824 Time(s) |
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Susan Robinson
Joined: 05 Aug 2010
Posts: 163
Location: Hancock, MI
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Posted: Mar 25, 2019 05:40 Post subject: Re: Cr-rich green Tremolite |
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Iron Out will remove a lot of the iron oxide stains, or you could use muriatic acid. If part of the matrix is marble/calcite, then the acid will attack it, resulting (maybe) in several smaller specimens, if they are unattached to the entire mass. The amphibole crystals under the calcite should be sharper and less-weathered, since the calcite protected them.
_________________ Susan Robinson |
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jonathan zvonko
Joined: 31 Dec 2018
Posts: 1
Location: Quebec
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Posted: Mar 25, 2019 08:52 Post subject: Re: Cr-rich green Tremolite |
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What is the locality? Looks similar to specimens I collected in Ontario. As Susan said Rust Out or Iron Out are two products on the market sold in plumbing supplies and both will soften and remove the iron containing soil and oxidized coatings, After that I used soda blasting for a final good shiny look. I do not like the hydrochloric acid, since the amphibole is hard you can remove some calcite manually so the natural look will be preserved.
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Susan Robinson
Joined: 05 Aug 2010
Posts: 163
Location: Hancock, MI
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Posted: Mar 25, 2019 13:55 Post subject: Re: Cr-rich green Tremolite |
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The specimen of tremolite crystals does not look as though it had chromium in it, since the green is not the right color. The only places that have produced Cr-tremolite in St. Lawrence Co. are the Balmat District and a locality in the township of Macomb. The marble quarries in the Gouverneur area did not have tremolite crystals like this in them, but your specimen may have occurred in the calc-silicate rock which is in association with the Gouverneur marble at the Hall farm locality.
_________________ Susan Robinson |
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R Saunders
Joined: 28 Jul 2018
Posts: 126
Location: Michigan
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Posted: Mar 25, 2019 16:23 Post subject: Re: Cr-rich green Tremolite |
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I only used the Cr-rich seeing it applied in a different post. I will correct my records thanks. I bought it at my club shop silent auction. It was collected by a member and the slip only say's Hall Farm, North Gouverneur, NY Thanks for the location, I will enter it and make card for it. I do have Iron Out powder from the hardware. Also how do you tell Chromium rich?
Bob
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Susan Robinson
Joined: 05 Aug 2010
Posts: 163
Location: Hancock, MI
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Posted: Mar 25, 2019 17:44 Post subject: Re: Cr-rich green Tremolite |
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Cr-rich tremolite has a much brighter green color, almost like someone soaked the crystals in creme de menthe liqueur. Look up "Cr-tremolite, Washburn farm, Macomb, NY" on Mindat or even "Cr-tremolite, Balmat, NY". You'll see the difference in the green color. The famous locality at Outokumpu, Finland, produced Cr-rich diopside crystals, too.
I hope this information is helpful.
_________________ Susan Robinson |
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Bob Harman
Joined: 06 Nov 2015
Posts: 765
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Posted: Mar 25, 2019 18:18 Post subject: Re: Cr-rich green Tremolite |
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For a quick idea, look at my self collected example on the NY page 2 (July 2016) of "a mineralogical trip thru the states of the USA" on this website. BOB
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