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28 Feb-07:59:13 Re: appropriate photo editing software (Niels Brouwer)
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27 Feb-23:55:44 Isotopic composition of german silvers (Brent Lockhart)
27 Feb-18:29:55 Re: appropriate photo editing software (Rweaver)
27 Feb-17:15:04 Re: taking great photographs (Jordi Fabre)
27 Feb-16:54:53 Re: appropriate photo editing software (Kevin Conroy)
27 Feb-16:11:21 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
27 Feb-15:16:11 Appropriate photo editing software (Marvinlewinsky)
27 Feb-15:02:50 Re: taking great photographs (Marvinlewinsky)
27 Feb-13:58:29 The mizunaka collection - quartz with plancheite (Am Mizunaka)
27 Feb-12:09:55 Re: collection of annemieke en rob schnerr (Rob Schnerr)
27 Feb-10:54:23 Re: azurite to malachite pseudomorph research (Bob Kerr)
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27 Feb-10:05:37 Re: azurite to malachite pseudomorph research (Raystraw)
27 Feb-06:36:27 Re: azurite to malachite pseudomorph research (Roger Warin)
27 Feb-04:59:23 Re: azurite to malachite pseudomorph research (Peter Lemkin)
27 Feb-04:36:35 Re: azurite to malachite pseudomorph research (Basti)
26 Feb-23:53:32 Re: azurite to malachite pseudomorph research (Roger Warin)
26 Feb-22:17:49 Re: taking great photographs (Bob Harman)
26 Feb-22:16:21 Re: taking great photographs (Matt_zukowski)
26 Feb-19:35:06 Re: taking great photographs (Marvinlewinsky)
26 Feb-19:33:58 Re: taking great photographs (Marvinlewinsky)
26 Feb-16:45:01 Re: collecting and imagining. (Sante Celiberti)
26 Feb-14:52:07 Re: magnetite or franklinite? (Cascaillou)

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  Topic: Clinozoisite... what it is and how was it formed?
RockHunter

Replies: 2
Views: 565

PostForum: Minerals and Mineralogy   Posted: Dec 16, 2019 03:52   Subject: Re: Clinozoisite... what it is and how was it formed?
Thank you, Roger for your insight.
  Topic: Clinozoisite... what it is and how was it formed?
RockHunter

Replies: 2
Views: 565

PostForum: Minerals and Mineralogy   Posted: Dec 14, 2019 06:13   Subject: Clinozoisite... what it is and how was it formed?
I googled clinozoisite and mostly came up with chemical formula name etc... I am more interested in how was it formed?

What condition(s), what kind of environment is needed in order to develop cli ...
  Topic: What type of metamorphic rock is this?
RockHunter

Replies: 16
Views: 1065

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 13, 2019 16:18   Subject: Re: What type of metamorphic rock is this?
Sorry to forgot to add the last photo, which I think will cement the understanding of what it is...

Am I right to name that staurolite? Yes. Under cross-polarised light, it doesn't stay dark.

I ...
  Topic: What type of metamorphic rock is this?
RockHunter

Replies: 16
Views: 1065

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 13, 2019 15:43   Subject: Re: What type of metamorphic rock is this?
I did checked garnet and staurolite's PT ranges...

This is what I found, Kevin... garnet max out at 550 degree C and staurolite max out at 600 degree C.

Therefore, if both co-exist the maximum ...
  Topic: What type of metamorphic rock is this?
RockHunter

Replies: 16
Views: 1065

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 13, 2019 13:50   Subject: Re: What type of metamorphic rock is this?
Thank you, Bob Carnein.

This is my take... the porphyroblast is garnet (Grt) surrounded by muscovite, biotite and chlorite (mica minerals).

There is another picture, which I forgot to add, has ...
  Topic: What type of metamorphic rock is this?
RockHunter

Replies: 16
Views: 1065

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 12, 2019 13:00   Subject: Re: What type of metamorphic rock is this?
Very interesting, Kevin. Thank you for your insight.

I'm just grasping the basics here and I do know for a fact that all the pictures here are to do with the same rock. The dead give away is the po ...
  Topic: What type of metamorphic rock is this?
RockHunter

Replies: 16
Views: 1065

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 12, 2019 12:44   Subject: Re: What type of metamorphic rock is this?
The thin section pics are part of the whole package to do with the rock in the first post.
  Topic: What type of metamorphic rock is this?
RockHunter

Replies: 16
Views: 1065

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 12, 2019 11:48   Subject: Re: What type of metamorphic rock is this?
Thank you your observation and everyone else's.

I agree being on the fence regarding gneiss and schist. What pushed me toward schist was the fact that the rock contains porphyroblasts under a narr ...
  Topic: What type of metamorphic rock is this?
RockHunter

Replies: 16
Views: 1065

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 12, 2019 09:42   Subject: Re: What type of metamorphic rock is this?
Yes. More like a narrow ductile shear zone with mylonite.

I've added a plane-polarised and crossed polar pics. The centre mineral stays the same colour during 360 degrees rotation. The surrounding ...
  Topic: What type of metamorphic rock is this?
RockHunter

Replies: 16
Views: 1065

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 12, 2019 08:52   Subject: Re: What type of metamorphic rock is this?
Yes. A lot of the rocks on display are labelled. This one is from a room where kids can pick up a rock and throw under a microscope. There is a box of rocks where you can guess what it is.

Why gne ...
  Topic: What type of metamorphic rock is this?
RockHunter

Replies: 16
Views: 1065

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 12, 2019 07:20   Subject: What type of metamorphic rock is this?
Hello all,

Just started taken interested in rocks especially metamorphic types. Saw this interesting rock at Cardiff museum.

I'm sure it is a low-grade foliated metamorphic rock because of the ...
 
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