User:Chris857/Pyrochroite

Pyrochroite
Pyrochroite
	Black pyrochroite crystals with tan pyroaurite in a calcite matrix
General
Category	Mineral
Formula; (repeating unit)	Mn(OH)2
Strunz classification	4.FE.05
Dana classification	6.2.1.3
Crystal system	Trigonal
Space group	Hexagonal Scalenohedral; H-M symbol: 3m (3 2/m)
Unit cell	a = 3.31Å, c = 4.74Å, Z = 1
Identification
Cleavage	Perfect on {0001}
Tenacity	Elastic
Mohs scale hardness	2.5 to 3
Luster	Pearly on cleavages; Adamantine
Streak	White
Diaphaneity	Translucent, opaque
Density	3.23 to 3.27 g/cm3
Optical properties	Uniaxial (-)
Refractive index	nω = 1.680 to 1.681; nε = 1.720 to 1.723
Birefringence	δ = 0.040
Pleochroism	Visible
Ultraviolet fluorescence	Non-fluorescent
References

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Description

Pyrochroite has been found in association with alabandite, barite, calcite, dolomite, galaxite, hausmannite, lead, manganosite, rhodochrosite, and tephroite.^[1]

History

Distribution

Pyrochroite has been found in Canada, China, Ghana, Japan, Namibia, Romania, Russia, South Africa, Sweden, Switzerland, the UK, the US, and along the Mid-Atlantic Ridge.^[3]

References

^ ^a ^b ^c "Pyrochroite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved June 28, 2012.
^ ^a ^b ^c "Pyrochroite". Webmineral. Retrieved June 29, 2012.
^ ^a ^b "Pyrochroite". Mindat. Retrieved June 28, 2012.

Bibliography

External links

Media related to Pyrochroite at Wikimedia Commons

[handbook-1] "Pyrochroite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved June 28, 2012.

[webmin-2] "Pyrochroite". Webmineral. Retrieved June 29, 2012.

[mindat-3] "Pyrochroite". Mindat. Retrieved June 28, 2012.

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