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Crystal cluster with bluish rocks in it held together with calcite?
  
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cheald




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PostPosted: Aug 10, 2018 10:45    Post subject: Crystal cluster with bluish rocks in it held together with calcite?  

Hi everyone, I'm a novice at best when it comes to mineralogy and just trying to figure out what I've picked up over the years in efforts to reduce the collection.


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Pete Modreski
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PostPosted: Aug 10, 2018 11:37    Post subject: Re: Crystal cluster with bluish rocks in it held together with calcite?  

Dear cheald,

Your photos really do not give enough information to give us any chance of identifying the mineral(s) in your specimen--other than the white calcite, which seems pretty obvious, because of its cleavage.

Before posting, you really should have read the guidelines that are posted at the beginning of our "FOR BEGINNERS: What is it? Where is it from?". If you click on that page link (it appears at the top left of this column of posts), and then at the first item it that list of posts, it will take you do a very good guide of the different physical characteristics and tests that one can use to identify a mineral. We really consider it to "required" that anyone posting a picture or description to ask us to identify, have read this advice and done their best to give us at least as much of the information one can obtain that way, as possible (such as--what is the approximate hardness of the unknown mineral? cleavage, if visible? does it bubble in acid?). Without your doing this, anyone on the Forum is really just wasting their time, trying to make guesses without any information. Also, anything this is known about the source (locality) of the specimen might be of help, even to say what state or even country it is from (this is a world-wide forum, as you may have noticed). So if you want you questions about identification to be taken seriously, please do your best to study your specimen(s) and supply as much of the needed information as you can.

Just one other comment--as a matter of politeness, it is usually appreciated if anyone posting something to this forum, take the trouble to at least in some way "introduce themselves"--to tell us something about who you are, where you live (again, what city/state/country?), and the extent of your interest in minerals. Instead of just an anonymous "identity name" which means nothing to anyone.

Please don't take my comments as an attack or criticism; this is really what you should do, if you want others on the forum to take the trouble to be interested in your question(s), and the time to respond to them.
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Justin Hickok




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PostPosted: Aug 11, 2018 00:30    Post subject: Re: Crystal cluster with bluish rocks in it held together with calcite?  

Almost looks like wollastonite but that's the importance of self testing as Pete mentioned.
And locality might help.
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Jordi Fabre
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PostPosted: Aug 11, 2018 07:52    Post subject: Re: Crystal cluster with bluish rocks in it held together with calcite?  

Pete Modreski wrote:
...Before posting, you really should have read the guidelines that are posted at the beginning of our "FOR BEGINNERS: What is it? Where is it from?". If you click on that page link (it appears at the top left of this column of posts), and then at the first item it that list of posts, it will take you do a very good guide of the different physical characteristics and tests that one can use to identify a mineral...

The guidelines mentioned by Pete: What is it? - Where is it from?
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cheald




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PostPosted: Aug 11, 2018 13:09    Post subject: Re: Crystal cluster with bluish rocks in it held together with calcite?  

The rock was found somewhere in the United States, locality unknown. (This is just one of the many "cool looking rocks" found since I was a small child)

The matrix rock is either the bluish grayish rock which sparkles slightly in the light or the white calcite? rock

there are white milky areas, clear, clear w/ tea & tea colored areas , and a few areas have a rainbow like shine

The luster is non metallic with dull and glassy areas

unknown streak at this time

the area tested scratched the copper penny then was scratched by 440 steel knife
hardness of 3?

The rock is some what transparent very clear in some areas
I think it cleavages in 1 2 3 and 4 directions
and it is kinda black light reactive

And I don't keep hydrochloric acid on hand but I did pour some 5% vinegar on the rock and it did show some reactivity
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Jordi Fabre
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PostPosted: Aug 13, 2018 02:01    Post subject: Re: Crystal cluster with bluish rocks in it held together with calcite?  

From your tests is not doubt that you have Calcite but there are not evidences about what could be the "bluish grayish rock"

Do you tested also this "bluish grayish rock" or you tested only the white material? (the Calcite)
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cheald




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PostPosted: Aug 13, 2018 16:30    Post subject: Re: Crystal cluster with bluish rocks in it held together with calcite?  

So it is calcite, Thank you!

My guess basis was derived from google image search..... I did test the blue rock as well as the clear parts of white just not the white part of the white.

it was harder than copper softer than 440 steel

streak test unavailable

non reactive in the 5% vinegar

and it did not react under the black light
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