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www.mineralgallery.co.za Minerals P-T |
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Pyrochroite |
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Name
Pyrochroite
Chemistry
Mn(OH)2
Uses
Mineral specimen
Color
Blue, colorless, dark brown, white, pale green
Hardness
2.5-3
Specific gravity
Crystals
Trigonal, Hexagonal-Scalenohedral
Accompanied by:
Hydrogen, Oxygen, Manganese
Fracture
Flexible
Luster
Adamantine
Cleavage
Perfect
Streak
white
Similar to:
Brucite
Name from the Greek, puro, "fire" and khroma, "color", because of the change in color upon ignition.
Occurs as euhedral crystals and massive coarse and fine grained material.
Commonly euhedral crystals are part lustrous, simple, rhombic in cross-section, equant in habit, and rarely elongate, rhombic and scalenohedral forms are common.
Some crystals are pseudocubic.
Pyrochroite is a manganese hydroxide mineral and the Mn-analogue of Brucite.
