602 - Colemanite

ID	602
Mineral	Colemanite
Location	Turkey
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Colemanite information at mindat.org

ID	1108
Long ID	1:1:1108:8
Formula	`CaB₃O₄(OH)₃ · H₂O`
IMA Status	0 1
Description	The fluorescence observed for Turkish specimens may come from As3+ and/or As5+, that were found to be present in the amount up to 125 ppm (Helvacı et al, 2017).
General Appearance	Like semi-crystalline calcite.
Occurrence	Evaporite borate deposit.
Other Occurrences	Borate deposits formed in arid alkalai lacustrine environments.
Industrial	Ore of boron.
Discovery Year	1884
Diapheny	Transparent,Translucent
Cleavage	On {010} perfect; on {001} distinct.
Colour	Colourless, white, yellowish, grey; colourless in transmitted light
Hardness (min)	4.5
Hardness (max)	4.5
About the name	Named in 1883 in honor of William Tell Coleman (29 February 1824, Cynthiana, Kentucky, USA - 22 November 1893, San Fransico, California, USA), a founder of the California borax industry and owner of the mine where the mineral was first found.
Streak	White
Crystal System	Monoclinic
Cleavage Type	Perfect
Fracture type	Irregular/Uneven,Sub-Conchoidal
Morphology	Crystals commonly short prismatic [001] with large (110), large to small (001) and complex terminations; pseudo-rhombohedral with large (110) and (_301); pseudo-octahedral with large (_221) and (011). Massive, cleavable to granular and compact.
UV	Bright pale yellow fluorescence, may phosphoresce pale green.
Thermal Behaviour	Before the blowpipe it exfoliates, decrepitates violently, and melts imperfectly.
Publication Year	1883
key_elements	0
shortcode_ima	Cole

Colemanite