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Mineralpedia Details for Herderite

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Herderite

Herderite

Named in honor of Siegmund August Wolfgang von Herder, a mining official of Freiberg, Germany. Herderite is difficult, if not nearly impossible to distinguish from its hydroxyl-dominant analogue hydroxylherderite. While found originally in Germany, the analysis of this initial material is suspect and additional material from the locality is now unavailable. A gem of Herderite from supposedly Brazil is the only known fluorine-dominant Herderite that has been proven via modern analytical methods, so it is likely that most Herderite is actually hydroxylherderite. Herderite will fluoresce violet under ultraviolet light and has a cathodoluminescence and phosphorescence of pink-orange in X-rays.

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

Formula
CaBePO4
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
white, yellowish white, greenish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Sub Conchoidal 
Hardness
WebMineral
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Mindat
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Herderite from Berry-Havey quarry, East Poland, Androscoggin Co., Maine, United States

Herderite
            from Berry-Havey  quarry, East Poland, Androscoggin Co., Maine, United States

2.5mm crystal

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Herderite from Chhappu, Braldu Valley, Balistan, Northern Areas, Pakistan

Herderite
            from Chhappu, Braldu Valley, Balistan, Northern Areas, Pakistan

This is a whopper of a crystal for Herderite. It a complete doubly terminated crystal with two penetrating side kicks and a negative growth indentation. A few imperfections. Nice green color.

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