Akrochordite Knowpia

Akrochordite
Akrochordite
	Bright green, vitreous, cluster of eveite (under 0.5 mm) and brown, subhedral akrochordite in a contrasting, pink, granular carbonate matrix
General
Category	Phosphate minerals
Formula; (repeating unit)	(Mn,Mg)4(AsO4)2(OH)4·4H2O
IMA symbol	Akr
Strunz classification	8.DD.10
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) ; (same H-M symbol)
Space group	P21/c
Identification
Color	Yellowish red-brown, pale to dark brown, pale pink
Cleavage	Perfect. On {010} , perfect; a second, perpendicular to the first.
Tenacity	Brittle
Mohs scale hardness	3+1⁄2
Luster	Sub-Vitreous, resinous, dull
Diaphaneity	Translucent
References

Akrochordite is a rare hydrated arsenate mineral with the chemical formula (Mn,Mg)₄(AsO₄)₂(OH)₄·4H₂O and represents a small group of rare manganese (Mn) arsenates and, similarly to most other Mn-bearing arsenates, possess pinkish colour. It is typically associated with metamorphic Mn deposits.^[3]^[5]

References edit

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ Mineralienatlas
^ ^a ^b Mindat
^ Webmineral data
^ Handbook of Mineralogy

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[atlas-2] Mineralienatlas

[Mindat-3] Mindat

[Webmin-4] Webmineral data

[handbook-5] Handbook of Mineralogy

[3]

[5]

[1]

[2]

[4]

Summary

References edit