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Ca5(AsO4)3Cl
Hexagonal
Turneaureite was first described from Franklin, New Jersey; Långban, Sweden; and Balmat, New York, by Dunn et al. (1985b). It has not been found at Sterling Hill.
Franklin turneaureite occurs only as massive material. Hand-sized specimens are known; most are smaller. Turneaureite is white to grayish white to colorless with a subvitreous to slightly greasy luster. Cleavage was not observed. The hardness is approximately 5. Optically, turneaureite is uniaxial, negative, with indices of refraction near w = 1.708 and e = 1.700. Turneaureite is fluorescent with a bright orange color in shortwave ultraviolet; phosphorescence is weakly discernible. It is best verified using quantitative chemical tests and X-ray methods.
Turneaureite is a calcium arsenate chlorine mineral of the apatite group and the Cl analogue of johnbaumite. An analysis is presented in Table 24.
Turneaureite occurs as massive specimens, some larger than 5 cm in diameter, composed of massive turneaureite as the dominant mineral. It is associated with centimeter-sized aggregates of andradite, magnetite, and pink manganoan calcite. It may have been locally abundant.
Turneaureite was named in honor of Dr. Frederick Stewart Turneaure of the University of Michigan, in recognition of his contributions to the study of mineral deposits.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
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This
page created: January 11, 2001 |
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