Minrecordite

Minrecordite, CaZn(CO₃)₂, is a very rare mineral belonging to the dolomite group, the member with Ca and Zn. It was discovered, associated with dioptase, in a specimen from the Tsumeb mine (Namibia), which is consequently its type locality. Its name is a tribute to The Mineralogical Record magazine, representing the collaboration between professional and amateur mineralogists.^[5] In this locality it is associated primarily with dioptase, and less frequently with duftite, calcite and malachite.^[6] It is a rare mineral, which has been found only in a few deposits in the world. In addition to the type locality, it appears in the Preguiça mine, in Moura, district of Beja (Portugal).^[7]

Minrecordite
General
Category	Carbonate minerals Dolomite group
Formula	CaZn(CO3)2
IMA symbol	Mrd[1]
Strunz classification	5.AB.10
Crystal system	Trigonal
Crystal class	3 Rhomboehedral
Identification
Color	White, colourless
Crystal habit	Typically rhombohedral crystals saddle-shaped, twisted
Cleavage	Very good on [10-14]
Mohs scale hardness	3.5–4
Luster	Pearly
Streak	White
Diaphaneity	Translucent
Specific gravity	3.45
References	[2][3][4]