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Mineralpedia Details for Helvite

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Helvite

Helvite

Named for the Latin word helvus, which means “amber,” in reference to the mineral’s color, which is typically a golden-yellow. Helvite is an uncommon mineral that occurs in skarn, contact zones, gneiss, granite pegmatites, and granites. Localities for Helvite include in Germany, Sweden, Russia, Kyrgyzstan, Norway, Finland, the United States, Japan, and other localities. Helvite is pyroelectric and will generate a charge in response to heat application.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/helvine.pdf

Formula
Mn4Be3(SiO4)3S 
Crystal System
Isometric 
Crystal Habit
Massive 
Cleavage
Indistinct, Indistinct, Indistinct 
Luster
Vitreous - Resinous 
Color
brown, brownish yellow, gray, yellow, yellow green 
Streak
grayish white 
Class
Isometric - Hextetrahedral 
Fracture
Brittle 
Hardness
6-6.5 
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Helvite from Victoria district, Gage, New Mexico, United States

Helvite
            from Victoria district, Gage, New Mexico, United States

Yellowish-brown tetrahedrons to 3mm.

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Helvite from Wushan Spessartine mine, Tongbei, Zhangzhou, Fujian, China

Helvite
            from Wushan Spessartine mine, Tongbei, Zhangzhou, Fujian, China

Orange crystal to 1.3cm across.

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Helvite from Navegador mine, Conselheiro Pena, Minas Gerais, Brazil

Helvite
            from Navegador mine, Conselheiro Pena, Minas Gerais, Brazil

Light green tetrahedrons to 9mm.

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Helvite from Butte dist., Silver Bow Co., Montana, United States

Helvite
            from Butte dist., Silver Bow Co., Montana, United States
Special Info
Phillips Collection

Helvite according to Jenkins & Lorengo (Min. Record v. 33, n. 1 2002) is a rare mineral at Butte and was found in a single specimen from the Lexington mine. This specimen contains a single lemon yellow anhedral crystal grain in Rhodonite matrix.

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