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Author Topic: Identify this rock/mineral?  (Read 66175 times)

Offline Bass

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Identify this rock/mineral?
« Reply #75 on: 27/03/2008 20:21:45 »
The short answer- yes.

The presence of andalusite indicates certain temperature/pressure conditions- different from sillmanite and kyanite.
 

Offline Bass

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« Reply #76 on: 21/06/2008 17:43:35 »
Two minerals, one orangish red, the other yellow (ignore black matrix rock)

 

Offline JimBob

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« Reply #77 on: 22/06/2008 16:38:02 »
realgar and orpiment

if substrait isn't important, then the minerals are probably hydrothermal in origin.
 

Offline Bored chemist

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« Reply #78 on: 22/06/2008 19:42:51 »
Nice colour. Planning to poison anyone?
 

Offline JimBob

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« Reply #79 on: 22/06/2008 21:24:20 »
i read a lot of Agatha Christi.
 

Offline Bass

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« Reply #80 on: 23/06/2008 00:56:53 »
From one of the sed-hosted epithermal gold deposits in northern Nevada.  Orpiment and realgar (arsenic sulfides) are indicator minerals for these sorts of deposits.
 

Offline Andrew K Fletcher

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« Reply #81 on: 23/06/2008 08:46:58 »
i read a lot of Agatha Christi.
Jimbob.We live near Greenway. Agatha's home. It is on the River Dart in a beautiful setting with impressive gardens. Her tennis court is behind a walled in garden. We frequently walk the dogs down there and enjoy a cup of coffee in the café.

There is a huge clock above her place and I remember seeing the same picture of the clock somewhere else, possibly on a cover of one of her books.

The courtyard is granite cobblestones (3 times above background gamma radiation levels)

I will put some pictures on photobucket for you.
 

Offline Evie

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« Reply #82 on: 15/09/2008 21:53:17 »
I want a new picture!!!   Pretty please? [:X] [:X]
 

Offline Bass

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« Reply #83 on: 16/09/2008 00:51:31 »
Really don't have time for this, but since you asked so nicely....
What is the pink mineral?





I'll be back in 2-3 days, have fun with it till then.

Not so subtle hint:  Not flourite
 

Offline Evie

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« Reply #84 on: 16/09/2008 16:20:25 »
Rhodochrosite?
 

Offline Bass

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« Reply #85 on: 17/09/2008 06:33:39 »
Ahhh

Good guess, probably would have been my first guess as well.  But sorry, no Mn.
But as you have guessed, it is a secondary mineral (formed during weathering of another mineral).  When looking for deposits containing this metal, this mineral is the blooming key.
 

Offline Evie

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« Reply #86 on: 17/09/2008 15:44:10 »
Jeez...your hints have got my head going in a few different directions, but I guess I'll throw out another idea and see if it sticks...


Apatite?  ???
 

Offline frethack

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« Reply #87 on: 18/09/2008 03:27:22 »
I happen to poke my nose up from my books (4 tests in three days...just finished my sed rocks exam today) and - lo and behold - another mineral!  Ill take a stab in the dark at it.

How about Erythrite (the pink) and Cobaltkoritnigite (the purple).

Both secondary minerals in cobalt bearing deposits (Cobalt blooms).

 

Offline Evie

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« Reply #88 on: 18/09/2008 16:12:32 »
I happen to poke my nose up from my books (4 tests in three days...just finished my sed rocks exam today) and - lo and behold - another mineral!  Ill take a stab in the dark at it.

How about Erythrite (the pink) and Cobaltkoritnigite (the purple).

Both secondary minerals in cobalt bearing deposits (Cobalt blooms).



Ah, that sounds good!

My minerology is so rusty (no pun intended), but that's why I love this thread. It makes me exercise my flaccid brain muscles!
 

Offline Bass

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« Reply #89 on: 20/09/2008 19:30:19 »
I see that frethack can concentrate on his mineralogy while the old curmudgeon is drinking mint juleps in Kentucky.  Nice going!

Erythrite, or "cobalt bloom" is the main indicator for cobalt deposits.  Just so happens that two days after I posted this, I ran across erythrite in a place that shouldn't have any cobalt:



(my digital camera seems to have a problem distinguishing blue from purple- the dark blue is actually purple erythrite) ???
 

Offline Bass

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« Reply #90 on: 20/09/2008 19:45:48 »
An easy one.

This mineral's crystal form is hexagonal (six sided) prisms:

 

image from mindat.org

impurities make valuable gemstones.
 

Offline frethack

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« Reply #91 on: 21/09/2008 22:28:34 »
Im guessing its something like this...




I need to take a photography course...no matter what camera I use, my closeups are always blurry...grrr.  As soon as I can learn to take a photograph, Ill post a couple of minerals.

Anyway...Corundum :)

 

Offline JimBob

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« Reply #92 on: 23/09/2008 22:51:14 »
I see that frethack can concentrate on his mineralogy while the old curmudgeon is drinking mint juleps in Kentucky.  Nice going!

At least he posted this answer from his own computer, not my computer workstation on which he WAS SUPPOSED TO HAVE BEEN WORKING!!!!! He has committed this sin and then, when caught, blatantly said the time WILL appear on his next time sheet. Uppity young brat. Working with ArcGIS stuff is what he was to have been doing  - no. digitizing gravity data, that's it.
 

Offline frethack

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« Reply #93 on: 24/09/2008 00:39:53 »
Hehehe...not just the time JimBob, but the burger as well...double meat, double cheese.  Youre lucky I didnt get any grease on my shirt...I just might have included the dry cleaning!  ;D
 

Offline Pyroxene88

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« Reply #94 on: 14/11/2008 02:27:57 »
Here's a rock for you guys to ID! I'm not positive on what it is exactly, and any information it would be great!



Yes, the slab is wet because it still has saw marks that makes it hard to see what it is.

newbielink:http://pics.livejournal.com/spoinger/pic/0001zatt/ [nonactive]
 

Offline JimBob

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« Reply #95 on: 14/11/2008 03:05:36 »
The substrait is carpet. I know that. Geeze!

The other thing looks like part of a very spoiled and moldy specked trout.

Oh, by the way, I HATED mineralogy so I became a sedimentologist by default. And don't blame me for not knowing. Without me, all you hard rock guys would be freezing in the dark and riding horses - no heating oil, no coal, no natural gas = no heaters, energy or internal combustion engines. 

In fact I deserve a vote of thanks!

By the way did your wife give you any grief for getting the diamond saw oil on the carpet?????

Oh, By the way

WELCOME TO TNS !!!!! Hope you enjoy, join the fray, and add another rock nut to the mix!

 

Offline frethack

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« Reply #96 on: 14/11/2008 05:05:18 »
Without any information on hardness and using the carpet fibers for scale, Im going to venture a guess of Aventurine, though the possible presence of cleavage might suggest otherwise.

Any chance for a closeup pic of the dried sample?  Hard to tell if the dark and purple patches are crystals or inclusions.  Maybe even pics of the uncut side?

« Last Edit: 14/11/2008 05:06:56 by frethack »
 

Offline RD

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« Reply #97 on: 14/11/2008 05:22:28 »
Pyroxene88's sample...

« Last Edit: 14/11/2008 05:24:03 by RD »
 

Offline Bass

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« Reply #98 on: 14/11/2008 16:27:06 »
Purple-brown mineral appears to be harder and better crystallized than green-- probably garnet family.

My initial quick impression is eclogite.

But with no strongly developed planar mineral orientation, possibly skarn?  Where did you collect this specimen?
 

Offline JimBob

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« Reply #99 on: 15/11/2008 16:06:16 »
He found it in California or the Grenville province.

I suspect this is probably the sorosilicate idocrase, otherwise known as vesuvianite (also called Calforniaite) Since the associated minerals of green idocrase are garnets, calcite, wollastonite (one of these white minerals filling some of the fractures,) diopsid (dark linear non-garnet-lookng mineral) and serpentine. The cutting oil changes the actual colors. There is a ghost of hexagonal garnet crystal form on the left of the specimine just beyond the end of the white-filled vein.

From the carpet, I would guess that it is from the Grenville Province - unless it is from Italy.


See - I'm not as dumb as I look. I can be reasonably conversant in mineralogy (I can use a search engine) - and I keep you sissies warm.
« Last Edit: 18/11/2008 01:31:08 by JimBob »
 

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Identify this rock/mineral?
« Reply #99 on: 15/11/2008 16:06:16 »

 

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