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Identity HelpIs this a mica crystal?
28th Apr 2012 11:55 UTCJohn R. Montgomery 🌟 Expert
Thanks for any help
John
28th Apr 2012 12:23 UTCVik Vanrusselt Expert
Vik
28th Apr 2012 13:49 UTCJohn R. Montgomery 🌟 Expert
...you can click on pic to make it a bit larger.
The first pic shows the clean face.
The second pic shows the opposite face that is covered with some black substance, but you can still see the shiny face coming through: can this be cleaned? I have already soaked it in Super Iron Out.
2.3 cm x 1.5cm x 1.8cm ( I haven't done a scratch test because I don't want to wreck it in case it is mica)
thanks
John
28th Apr 2012 14:43 UTCSpencer Ivan Mather
Spencer.
28th Apr 2012 17:03 UTCDonald Slater
28th Apr 2012 17:09 UTCJohn R. Montgomery 🌟 Expert
Donald, no, it doesn't seem all that heavy, but I'm not very experienced.
I have recently done a specific gravity test using Reiner's easy method, so I'll do that and report back.
28th Apr 2012 17:12 UTCMaggie Wilson Expert
28th Apr 2012 17:28 UTCJohn R. Montgomery 🌟 Expert
I just did Reiner's specific gravity test and got 1.9 which is a lot closer to SG of mica than corundum... so I guess I can assume mica Maggie...thanks
I'm kind of amazed because every mica piece I've seen in the field has been broken!...and this is quite perfectly shaped.
Maggie, would you know how to clean that black stuff off the mica, safely?
thanks
John
28th Apr 2012 20:29 UTCMaggie Wilson Expert
One caveat - I'm not the chief cook and rock washer in this household - what I suggest above are my guesses - others with more experience, please chime in!
28th Apr 2012 21:11 UTCNeil Mathieson
Photo 1 and 3 does look like a mica, but photo 2 does not.
Photo 2 made me think of staurolite.
Just a thought.
28th Apr 2012 21:34 UTCStephanie Martin
Based on your SG result this does not fit staurolite, that is more closely comparable to the range of corundum.
I agree with Maggie on the cleaning, it may do more harm than good if too aggressive.
regards,
stephanie :-)
28th Apr 2012 21:55 UTCJohn R. Montgomery 🌟 Expert
2.6
Looking at the Mindat page for mica, that puts it pretty close ( not using distilled water)
And thanks Maggie and Stephanie re: cleaning... I will leave it alone...in fact the more I look at it, the more interesting it becomes as is!
John
28th Apr 2012 22:31 UTCStephanie Martin
cheers,
stephanie :-)
28th Apr 2012 22:41 UTCJohn R. Montgomery 🌟 Expert
29th Apr 2012 06:15 UTCAndrew Johns
29th Apr 2012 12:50 UTCJohn R. Montgomery 🌟 Expert
I collected it in the Gatineau area near Ottawa...I'll check out your photo page... but it s quite light (SG 2.6)
Maybe we will cross paths collecting in the Bancroft area ...I am planning on checking out the Burgess Mine soon... If you have any collecting tips from that mine I'd appreciate them ( I read Michael A.s article)
thanks for your input
John
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: May 11, 2024 12:20:33