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Author Topic: Identify this rock/mineral?  (Read 66127 times)

Offline Alandriel

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Identify this rock/mineral?
« Reply #50 on: 13/11/2007 20:53:24 »




Quote from: Bass
You might question your clever book then, Apatite (calcium phosphate) is non-metallic

**throws book away **

I give up

...this round that is

***goes looking on amazon for another rock book***

 

Offline Karen W.

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Identify this rock/mineral?
« Reply #51 on: 13/11/2007 21:01:49 »
Is it noticeably dense?
Close to, but a bit more dense than hematite (iron oxide) Fe2O3

I was right I thought it looked like iron oxide but I thought I was wrong with the quartz so I kept my mouth shut! LOL Dang... I should have said it! LOL!LOL! I actually collected rocks for years, but my son got into 5th grade and I donated my collection to the school as they had nothing to teach the kids as they had very few rocks and I had tons! LOL... I wish I still had them...... They were cool... Is it possible to miss your rock collection??? LOL My old friends! LOL... Better go before I dig myself a hole and fossilize!
 

Offline frethack

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« Reply #52 on: 14/11/2007 02:42:53 »
Quote
Good thought, Molly would be proud of you.


Hehehe...a very subtle hint.  I didnt get it until I looked up the streak and hardness.

Molybdenite...MoS2

Hardness of 1 to 1 1/2
Specific Gravity 4.7 to 4.8
Perfect cleavage, inelastically flexible, with a hexagonal crystal system
 

Offline frethack

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« Reply #53 on: 14/11/2007 02:46:18 »
btw Alandriel...you might try the Handbook of Rocks Minerals & Gemstones by Walter Schumann.  I like it quite a bit.  Not the best, but very well organized and cheap.
 

Offline Bass

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« Reply #54 on: 14/11/2007 05:40:38 »
Frethack pulls the rabbit out of the hat!  Twice!  In a row! 

Careful, or we might force you out of the closet for your geological leanings.  I thought surely someone would guess argentite.  I'll have to save that one for another day.
 

Offline Alandriel

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« Reply #55 on: 15/11/2007 11:31:39 »
Argentite. Right - lol - did the naming of that have anything to do with Argentina by any chance?

Thanks Frethack I'll definitely chase up that book recommendation.


Now.......................


may I ??

What is *this* (from my collection)






100 points to the one that can name the rock and place where I've found it (or rather haggled it from some native kids).
And a box of choccies to the one that names me the fishies (been dying to know for years!)
 ;D
 

Offline Bass

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« Reply #56 on: 16/11/2007 00:08:27 »
Cool fish!  They don't look deformed, so my guess for rock type is shale or siltite (not metamorphosed).  Old lake beds? 
Paleontology is not my area- so can't help with the fishies.  JimBob is better at this soft rock stuff, maybe he can help?
 

Offline JimBob

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« Reply #57 on: 16/11/2007 01:00:38 »
The best I can do is to say the fish are Teleost - bony ray finned fish. I never was any good at Vertebrate Paleontolgy.

In the NEW order of life - as opposed to the one I learned in the dark ages just after Linnaeus started work, these are classified as --

Kingdom:    Animalia
Phylum:    Chordata
Class:     Actinopterygii
Infraclass:    Teleostei

As for the rock; without doubt sedimentary and it looks like there may be some evaporate deposits (alabaster??) in it. Does the white stuff seem fairly soft - i.e., is it readily scratchable  Knowing the location of your book, Red Sea Sebkah deposits, Egypt to Horn of Africa  - with carbonates and silt - alternately out of water part of the year or longer and then brief periods of holding water that connected to a larger source of water, probably salty, the obvious Red Sea.

Then again, You could have gotten it from the Gobi Desert. What do I know?
 

Offline Alandriel

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« Reply #58 on: 16/11/2007 13:49:14 »

Gobi desert!?!   *******sighhhh *****   I wish

But yeah, it seems you know 'my book' too well and have a good fix on location LOL.
I got it from Syria - not exactly Red Sea but close enough.

Teleost - bony raw fish is a good enough fix for me and enough to go reference hunting. Cheerio!

PM me your addy and I shall keep my promise; name your fav choc poison or be surprised.
 ;D
 

Offline JimBob

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« Reply #59 on: 16/11/2007 17:12:02 »
BUT what about the rock - is it even close? - limestone, shale & possible anhydrite?
 

Offline Alandriel

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« Reply #60 on: 19/11/2007 16:43:19 »
I have NO idea - *YOU* are the expert!  ;D
 

Offline JimBob

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« Reply #61 on: 20/11/2007 01:13:49 »
Then I am right

(I'll look at it next summer on my trip to London.)
 

Offline Bass

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« Reply #62 on: 20/03/2008 00:55:08 »
Identify the blue-black mineral in the schist matrix.



hint: hardness varies depending on direction
 

Offline JimBob

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« Reply #63 on: 20/03/2008 18:56:12 »
Tourmaline
 

Offline Bass

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« Reply #64 on: 20/03/2008 22:06:40 »
not!

see hint
 

Offline Exodus

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« Reply #65 on: 22/03/2008 19:09:02 »
Argentite. Right - lol - did the naming of that have anything to do with Argentina by any chance?

Thanks Frethack I'll definitely chase up that book recommendation.


Now.......................


may I ??

What is *this* (from my collection)






100 points to the one that can name the rock and place where I've found it (or rather haggled it from some native kids).
And a box of choccies to the one that names me the fishies (been dying to know for years!)
 ;D


hmmm yes, i've seen one of those before, its a fossilised fish tank.
 

Offline JimBob

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« Reply #66 on: 22/03/2008 20:39:05 »
Smart Ar.....
 

Offline frethack

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« Reply #67 on: 26/03/2008 15:19:47 »
How about Kyanite?
 

Offline Bass

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« Reply #68 on: 26/03/2008 17:15:44 »
I knew I could count on frethack! 
Kyanite's hardness varies from 5 to 7 depending on the crystal direction.  The mineral is an aluminum silicate Al2SiO5, and is a polymorph of two other minerals- sillimanite and andalusite (that is, they have the same chemical composition, but form different crystals).

Metamorphic mineral that typically forms in high aluminum sedimentary rocks (shales) that undergo changes due to high temperatures/pressures.
« Last Edit: 27/03/2008 20:20:17 by Bass »
 

Offline frethack

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« Reply #69 on: 26/03/2008 22:52:02 »
Never thought Id hear myself say this, but I cant wait for mineralogy :)

Theres a good chance Ill be moving to JimBobs neck of the woods soon.  Barring some funkiness with my credits, I should be UT bound.

Ill have to find a few mineral pics to post!
 

Offline Bass

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« Reply #70 on: 27/03/2008 00:05:52 »
Good luck at UT!

Keep in mind that all the really interesting minerals are hard-rock (metamorphic-igneous).  Don't be swayed by those lazy soft-rockers.
 

Offline JimBob

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« Reply #71 on: 27/03/2008 01:25:00 »
Hook 'em Horns!!!! They are on to the next round of March Madness.

I haven't been able to do much of anything for the past two weeks. My father became rater ill at the nursing home and died last Friday as a result. His funeral is tomorrow. He was almost 91. After I finish the Eulogy I am giving I will post it, probably Saturday or Sunday, depending on family obligations. It is something I want to do.

 

Offline frethack

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« Reply #72 on: 27/03/2008 02:44:53 »
My condolences.
 

Offline JimBob

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« Reply #73 on: 27/03/2008 02:59:10 »
Thank you.
 

Offline frethack

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« Reply #74 on: 27/03/2008 20:12:14 »
Sillimanite and Kyanite are idex minerals to determine metamorphic grade, but is a(n?)dalusite also?  (I suppose I could look it up, but that would be less fun  :) )
« Last Edit: 27/03/2008 20:14:12 by frethack »
 

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Identify this rock/mineral?
« Reply #74 on: 27/03/2008 20:12:14 »

 

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