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Identity HelpIdentity help. Pink mineral in granite
24th May 2020 14:50 UTCJyrki Autio Expert
Kovela, Finland
Hardness 3. Conchoidal fracture.
Exists as irregular grains to 1 cm in microcline.
Directly in contact with biotite, microcline and monazite.
Seems to shrink and crack on weathered surface rock. Does not dissolve with time.
In picture small yellow crystals are monazite. FOV 4mm
Thank you
24th May 2020 15:15 UTCAlfredo Petrov Manager
24th May 2020 16:13 UTCJyrki Autio Expert
25th May 2020 02:05 UTCHarold Moritz 🌟 Expert
25th May 2020 12:24 UTCJyrki Autio Expert
No fluorescence.
I tested hardness again and it is between 2 and 3.
25th May 2020 13:43 UTCA. M.
25th May 2020 13:47 UTCLuís Martins 🌟
25th May 2020 17:14 UTCJyrki Autio Expert
Thanks for replies,
This is too soft for opal.
Clay mineral replacing plagioclase perhaps.
25th May 2020 18:46 UTCAlfredo Petrov Manager
And your first assumption of halloysite could be possible too.
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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: April 24, 2024 08:41:07