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Magnesite Svanbergite & Uvite

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SER508381

Magnesite Svanbergite & Uvite

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Description
Locality: 
Serra das Éguas, Brumado, Bahia, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.1 × 5.2 × 1.6 cm
Description

A cluster of white rombohedron of magnesite hosts some light orange svambergite crystals ond brown uvite

Mineral Data
What's on the rock

Magnesite

Formula: 
MgCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White
Type Locality: 
Magnisía Prefecture (Magnesia), Thessalia Department (Thessaly), Greece

Svanbergite

Formula: 
SrAl3(PO4)(SO4)(OH)6
Strunz: 
8.BL.05
Crystal System: 
Trigonal
Hardness: 
5.0
Streak: 
white
Type Locality: 
Hålsjöberg (Horrsjöberg), Torsby, Värmland, Sweden

Uvite

Formula: 
Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Group Parent: 
Tourmaline
Crystal System: 
Trigonal
Hardness: 
7.5
Colour: 
Black, greenish-black
Streak: 
Light-brown, light-green, or white

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