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Pleonaste & Fassaite

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MNR874245

Pleonaste & Fassaite

ex. Milan Okruhlica collection

Description Tabs

Description
Locality: 
Hodruša-Hámre, Žarnovica County, Banská Bystrica Region, Slovakia (Slovak Republic)
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
10.6 × 9.6 × 5 cm
Description

Black spinels (pleonast) with green fassaite crystals in the vugs of fassaite matrix. This is abandoned classic slovak locality sample.

ex.Milan Okruhlica collection

 

Mineral Data
What's on the rock

Pleonaste

Variety Of: 

Spinel

Formula: 
MgAl2O4
Strunz: 
4.BB.05
Hardness: 
7.5 - 8.0
Hardness: 
0.0

Fassaite

Variety Of: 

Augite

Formula: 
(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Strunz: 
9.DA.15
Hardness: 
5.5 - 6.0
Hardness: 
0.0