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Some Sort Of Quartz?


mountaindrowner

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Hello everyone! First post here and only been rockhounding for about 2 weeks now!
I was out at a nature trail when I started following an old dried up creek (very small) and started finding alot of these along the edges of the creek bed. They were pretty translucent and crystalline:

post-12097-0-18278600-1370376494_thumb.jpg

post-12097-0-52471600-1370376496_thumb.jpg

post-12097-0-26954800-1370376499_thumb.jpg

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Hi,

Photos are a little bit vague and the bright brightness prevent me from seeing well, but I wonder if it would not be about gypsum. If it is there, you can cross off it with your nail so much this rock is soft.

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Mâchoires sélaciennes récentes : ici
Hétérodontiques et sélaciens : ici
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Un Greg...

Badges-IPFOTH.jpg.f4a8635cda47a3cc506743a8aabce700.jpg Badges-MOTM.jpg.461001e1a9db5dc29ca1c07a041a1a86.jpg

 

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It is a soft rock, some parts i can scratch with my nail, some I cant.
Heres another photo:

post-12097-0-68762800-1370381207_thumb.jpg

Edited by mountaindrowner
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I agree with Coco, it looks a lot like gypsum. Try to scratch a piece with you fingernail, if it scratches, then it is gypsum.

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Yes, I would say it's rock gypsum (certainly not quartz). It's moderately soluble in water (more so at lower temperatures), so if you tumble it then it's gonna trend towards a rounded shape. Brushing it in warm or hot water with a little soap shouldn't hurt.

Edited by painshill

Roger

I keep six honest serving-men (they taught me all I knew);Their names are What and Why and When and How and Where and Who [Rudyard Kipling]

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Because it is so soft, tumbling it will yield a very nice white powder :P Gentle rinse with water and pat it dry to clean it.

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"Tumble gypsum" ? I'm french, and I don't understand, sorry :blush:

Gypsum is a very soft rock. Just use water and a cloth or a sponge for the dishes, because any object is going to to cross off it ;)

Coco

----------------------
OUTIL POUR MESURER VOS FOSSILES : ici

Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici
Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici
Mâchoires sélaciennes récentes : ici
Hétérodontiques et sélaciens : ici
Oeufs sélaciens récents : ici
Otolithes de poissons récents ! ici

Un Greg...

Badges-IPFOTH.jpg.f4a8635cda47a3cc506743a8aabce700.jpg Badges-MOTM.jpg.461001e1a9db5dc29ca1c07a041a1a86.jpg

 

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"Tumble gypsum" ? ...

"Tumbling" is the lapidary practice of polishing stones by means of rolling (with an electric motor, for days) a round container containing the stones and an abrasive.

"There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant

“Try to learn something about everything and everything about something.” - Thomas Henry Huxley

>Paleontology is an evolving science.

>May your wonders never cease!

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"Tumble" here refers to polishing in a rock tumbler. Not a good idea with very soft rocks and minerals.

Edit: I'm going to have to start typing faster :(

Edited by Scylla
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Hi,

Thanks Chas and Scylla, in France we tell "Vibrolap", perhaps it is a trademark.

Coco

----------------------
OUTIL POUR MESURER VOS FOSSILES : ici

Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici
Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici
Mâchoires sélaciennes récentes : ici
Hétérodontiques et sélaciens : ici
Oeufs sélaciens récents : ici
Otolithes de poissons récents ! ici

Un Greg...

Badges-IPFOTH.jpg.f4a8635cda47a3cc506743a8aabce700.jpg Badges-MOTM.jpg.461001e1a9db5dc29ca1c07a041a1a86.jpg

 

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