Selenite and Pyrochroite

Selenite and Pyrochroite

ID	513
Mineral	Selenite Pyrochroite
Location	N'Chwaning II Mine - Kuruman - Northern Cape - South Africa
Fluorescence	LW-UV: close SW-UV: close
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Mindat data

ID	5527
Long ID	1:1:5527:3
IMA Status	0 1
Variety of	1784
Entry type	2
Description	The name 'selenite' is mostly synonymous with gypsum but has been used historically to describe the transparent variety, as opposed to satin spar gypsum for the fibrous variety and alabaster for the fine-grained massive form. The original name was ...
Diapheny	Transparent
Colour	Colourless, light tints due to included matter
Hardness (min)	2.0
Hardness (max)	2.0
About the name	From the Greek σελήυη, for "moon," in allusion to the moon-like white reflections of the mineral or to the quality of the light transmitted by translucent gypsum slabs of cleavages used as windows.
Crystal System	Monoclinic
Fracture type	Micaceous

ID	3317
Long ID	1:1:3317:2
Formula	`Mn²⁺(OH)₂`
IMA Status	0 1
Discovery Year	1864
Diapheny	Translucent,Opaque
Cleavage	On {0001}
Tenacity	elastic
Colour	Colourless, greenish, bluish (fresh), brown to black (exposed); flesh-red or amethystine in transmitted light
Hardness (min)	2.5
Hardness (max)	3.0
About the name	Named in 1864 by Lars Johan Igelstrom from the Greek πύρ, "fire", and χρώσις, "colouring", in allusion to the change of color upon ignition.
Crystal System	Trigonal
Cleavage Type	Perfect
Morphology	Crystals tabular {0001}; also less commonly rhombohedral with large {101_2} or {101_1}. Rarely prismatic [0001] with {112_0} and {0001} developed. Foliated masses.
Comment Luster	Pearly on cleavages
shortcode_ima	Pyc
Group	Brucite Group

Price: € 30

Dimensions: Not registered

Weight: Not registered

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Notes:

Symbol	Element
Ca	Calcium
H	Hydrogen
Mn	Manganese
O	Oxygen
S	Sulfur