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| Search found 11 matches |
| Author | Message |
|---|---|
 Topic: Clinozoisite... what it is and how was it formed? |
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| RockHunter Replies: 2 Views: 565 |
 Forum: 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? |
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| RockHunter Replies: 2 Views: 565 |
Forum: 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 ... |
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| Topic: What type of metamorphic rock is this? |
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| RockHunter Replies: 16 Views: 1065 |
Forum: 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 ... |
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| Topic: What type of metamorphic rock is this? |
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| RockHunter Replies: 16 Views: 1065 |
Forum: 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 ... |
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| Topic: What type of metamorphic rock is this? |
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| RockHunter Replies: 16 Views: 1065 |
Forum: 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 ... |
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| Topic: What type of metamorphic rock is this? |
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| RockHunter Replies: 16 Views: 1065 |
Forum: 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 ... |
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| Topic: What type of metamorphic rock is this? |
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| RockHunter Replies: 16 Views: 1065 |
Forum: 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? |
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| RockHunter Replies: 16 Views: 1065 |
Forum: 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 ... |
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| Topic: What type of metamorphic rock is this? |
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| RockHunter Replies: 16 Views: 1065 |
Forum: 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 ... |
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| Topic: What type of metamorphic rock is this? |
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| RockHunter Replies: 16 Views: 1065 |
Forum: 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 ... |
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| Topic: What type of metamorphic rock is this? |
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| RockHunter Replies: 16 Views: 1065 |
Forum: 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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