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Search found 10 matches |
Author | Message |
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Topic: Phillipsite - Marburg twin | |
dtkasper Replies: 9 Views: 13555 |
Forum: Minerals and Mineralogy Posted: Apr 21, 2012 04:58 Subject: Re: Phillipsite - Marburg twin |
How about dehydration of phillipsite to andalusite. The byproducts would be silica, water, and calcium oxide. That CaO would be your colorant. The crystalline end-on look being cubic then matches a ... | |
Topic: Mineral specimens with inclusions - (28) | |
dtkasper Replies: 95 Views: 233378 |
Forum: Featured Columns of FMF Posted: Sep 13, 2011 22:20 Subject: Re: Mineral specimens with inclusions |
Does Koivula also study inclusions in agates? | |
Topic: Mineral specimens with inclusions - (28) | |
dtkasper Replies: 95 Views: 233378 |
Forum: Featured Columns of FMF Posted: Sep 13, 2011 22:09 Subject: Re: Mineral specimens with inclusions |
I have never seen goethite dendrites in an agate. These appear to be one of the manganese dendritic minerals. | |
Topic: Mineral specimens with inclusions - (28) | |
dtkasper Replies: 95 Views: 233378 |
Forum: Featured Columns of FMF Posted: Sep 13, 2011 22:07 Subject: Re: Mineral specimens with inclusions |
Goethite/cacoxenite.
Melody wrote a recent book on healing stones. She is a prolific writer of her analysis of all the powers of stones of the world. She is out of England. She labelled cacoxeni ... |
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Topic: Mineral specimens with inclusions - (28) | |
dtkasper Replies: 95 Views: 233378 |
Forum: Featured Columns of FMF Posted: Sep 13, 2011 22:02 Subject: Re: Mineral specimens with inclusions |
Skalwold -> https://www.mineral-forum.com/message-board/viewtopic.php?p=19262#19262
Air or oil captured in silica. Compression made them into discoids. I would doubt any crystallography is inv ... |
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Topic: Can someone clarify what 'adularia' is? - What is meant by 'variety'? | |
dtkasper Replies: 20 Views: 48015 |
Forum: Minerals and Mineralogy Posted: Sep 13, 2011 21:49 Subject: Re: Can someone clarify what 'adularia' is? - What is meant by 'variety'? |
Look under a microscope. See a certain structural shape. See the sheen. Classify it generally as adularia. The exact species is unkown without XRD. See another specimen with clay and quartz. Cal ... | |
Topic: Fossils, perimorphs and pseudomorphs | |
dtkasper Replies: 4 Views: 10851 |
Forum: Minerals and Mineralogy Posted: Dec 28, 2010 17:35 Subject: Re: Fossils, perimorphs and pseudomorphs |
My Ikaite from CA looks like dogtooth calcite that someone shot with a wagner spray gun. It is covered in tiny splatterings of carbonate that get built up enough they oozed down like a caliche looks. ... | |
Topic: Fossils, perimorphs and pseudomorphs | |
dtkasper Replies: 4 Views: 10851 |
Forum: Minerals and Mineralogy Posted: Dec 28, 2010 01:22 Subject: Re: Fossils, perimorphs and pseudomorphs |
I had a chance to study and photograph the famous Klement pineapple opal recently. I like the interpretation that it is opaline mineralization of glauberite. The striations on the individual crystal ... | |
Topic: Endomorph or Pseudomorph? | |
dtkasper Replies: 49 Views: 119535 |
Forum: Minerals and Mineralogy Posted: Dec 27, 2010 04:33 Subject: Re: Endomorph or Pseudomorph? |
Neither.
The solution had two phases. The dolomite formed first and the calcite was entrapped second. The pyrite created some acidity leading to the dissolution of the calcite. An equivalent wit ... |
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Topic: Endomorph or Pseudomorph? | |
dtkasper Replies: 49 Views: 119535 |
Forum: Minerals and Mineralogy Posted: Dec 27, 2010 04:17 Subject: Re: Endomorph or Pseudomorph? |
Neither.
The main band looks like a hash of zeolite, perhaps natrolite. They make the short rods with rounded tips. Then calcite formed on top of the hash. It encased most of the natrolite, but not ... |
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