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Herderite Var Hydroxylherderite

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MGR820379

Herderite Var Hydroxylherderite

Rare Mineral

Description Tabs

Description
Locality: 
Quixaba Pegmatite, Frei Martinho, Borborema Province, Paraiba, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 3.9 × 2.4 cm
Description

Herderite is generally a rare mineral - hydroxylhederite from this locality is an exceptional rarity. I would say that there was never more than a fist-ful of this pieces from Brazil. The crystals show a spectacular dimension for herderite; they are all sharp terminated and end-pointed. Should be very high ranked for out-standing rarity.

Mineral Data
What's on the rock

Herderite

Formula: 
CaBePO4(F,OH)
Strunz: 
8.BA.10
Crystal System: 
Monoclinic
Hardness: 
5.0 - 5.5
Type Locality: 
Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany

Hydroxylherderite

Formula: 
CaBe(PO4)(OH,F)
Strunz: 
8.BA.10
Crystal System: 
Monoclinic
Hardness: 
5.0 - 5.5
Streak: 
white