Helvite

Helvite Breitenbrunn, Erzgebirge, Saxony, Germany Small Cabinet, 5.6 x 4.1 x 3.5 cm © irocks

Chemical Formula: Mn4(Be3Si3O12)S
Locality: Schwarzenberg and Breitenbrunn, Germany.
Name Origin: From the Greek helios – “sun.”

Physical Properties

Cleavage: {111} Indistinct, {111} Indistinct, {111} Indistinct
Color:  Brown, Brownish yellow, Gray, Yellow, Yellow green.
Density: 3.16 – 3.36, Average = 3.26
Diaphaneity: Translucent to opaque
Fracture: Brittle – Generally displayed by glasses and most non-metallic minerals.
Hardness: 6-6.5 – Orthoclase-PyriteLuminescence:     Fluorescent, Short UV=deep red, Long UV=deep red.
Luster: Vitreous – Resinous
Streak: grayish white

Photos :

Helvite Tongbei, Fujian Province, China Miniature, 4.5 x 3.3 x 2.7 cm © irocks
Helvite Tongbei, Fujian Province, China Miniature, 4.3 x 2.1 x 1.9 cm © irocks
Helvine Antonsthal, Breitenbrunn District, Erzgebirge, Saxony, Germany Specimen weight:110 gr. Crystal size:0,3 cm Overall size: 60mm x 37 mm x 40 mm © minservice
Helvite Rincon, California, USA Thumbnail, 2.6 x 2.2 x 2.5 cm © irocks
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