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Falcondoite & Willemseite

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TPX790398

Falcondoite & Willemseite

Type Locality

Description Tabs

Description
Locality: 
Falcondo Mine, Bonao, La Vega Province, Dominican Republic
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.4 × 3.5 × 2.2 cm
Weight: 
15.00gr
Description

Here is a wonderful specimen of the rare Falcondoite and willemseite. Falcondoite and willemseite are rare nickel and magnesium silicates found in a serpentinized harzbergite massif from an obducted ophiolite at a plate collision of oceanic crust with continental crust. The locality is in the Dominican Republic, which is the Type Locality for falcondoite. Nowadays it is very difficult to find specimens of this mineral because the mine is closed many years ago. This piece, and some other more, are part of a nodule that a miner had at the door of his house and he had kept it as a memory of his days in the mine, it was very hard to get him to sell us the rock, but in the end we got it.

Mineral Data
What's on the rock

Falcondoite

Formula: 
(Ni,Mg)4Si6O15(OH)2·6H2O
Strunz: 
9.EE.25
Crystal System: 
Orthorhombic
Hardness: 
2.0 - 3.0
Type Locality: 
Loma Peguera, Bonao, Monseñor Nouel Province, Dominican Republic

Willemseite

Formula: 
(Ni,Mg)3(Si4O10)(OH)2
Strunz: 
9.EC.05
Hardness: 
0.0
Type Locality: 
Scotia Talc mine, Bon Accord, Barberton, Ehlanzeni District, Mpumalanga Province, South Africa

Seller Information

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