FMF - Friends of Minerals Forum, discussion and message board

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 ...

Does Koivula also study inclusions in agates?

I have never seen goethite dendrites in an agate. These appear to be one of the manganese dendritic minerals.

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 ...

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 ...

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 ...

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. ...

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 ...

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 ...

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 ...

Author	Message
Topic: Phillipsite - Marburg twin
dtkasper Replies: 9 Views: 16384	Forum: Minerals and Mineralogy Posted: Apr 21, 2012 04:58 Subject: Re: Phillipsite - Marburg twin
dtkasper Replies: 9 Views: 16384	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: 298212	Forum: Featured Columns of FMF Posted: Sep 13, 2011 22:20 Subject: Re: Mineral specimens with inclusions
dtkasper Replies: 95 Views: 298212	Does Koivula also study inclusions in agates?
Topic: Mineral specimens with inclusions - (28)
dtkasper Replies: 95 Views: 298212	Forum: Featured Columns of FMF Posted: Sep 13, 2011 22:09 Subject: Re: Mineral specimens with inclusions
dtkasper Replies: 95 Views: 298212	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: 298212	Forum: Featured Columns of FMF Posted: Sep 13, 2011 22:07 Subject: Re: Mineral specimens with inclusions
dtkasper Replies: 95 Views: 298212	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 ...
Topic: Mineral specimens with inclusions - (28)
dtkasper Replies: 95 Views: 298212	Forum: Featured Columns of FMF Posted: Sep 13, 2011 22:02 Subject: Re: Mineral specimens with inclusions
dtkasper Replies: 95 Views: 298212	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 ...
Topic: Can someone clarify what 'adularia' is? - What is meant by 'variety'?
dtkasper Replies: 20 Views: 56040	Forum: Minerals and Mineralogy Posted: Sep 13, 2011 21:49 Subject: Re: Can someone clarify what 'adularia' is? - What is meant by 'variety'?
dtkasper Replies: 20 Views: 56040	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: 12637	Forum: Minerals and Mineralogy Posted: Dec 28, 2010 17:35 Subject: Re: Fossils, perimorphs and pseudomorphs
dtkasper Replies: 4 Views: 12637	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: 12637	Forum: Minerals and Mineralogy Posted: Dec 28, 2010 01:22 Subject: Re: Fossils, perimorphs and pseudomorphs
dtkasper Replies: 4 Views: 12637	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: 280695	Forum: Minerals and Mineralogy Posted: Dec 27, 2010 04:33 Subject: Re: Endomorph or Pseudomorph?
dtkasper Replies: 49 Views: 280695	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 ...
Topic: Endomorph or Pseudomorph?
dtkasper Replies: 49 Views: 280695	Forum: Minerals and Mineralogy Posted: Dec 27, 2010 04:17 Subject: Re: Endomorph or Pseudomorph?
dtkasper Replies: 49 Views: 280695	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 ...