Akrochordite

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]

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	(Mn,Mg)4(AsO4)2(OH)4·4H2O
IMA symbol	Akr[1]
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	[2][3][4]