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(Mg-Zn-carbonate)
Mineral-F, an unnamed opaque, white, fine-grained Mg-Zn carbonate mineral, was described from Franklin and Sterling Hill by Dunn (1986).
It occurs as a late-stage mineral, commonly frothy or bulbous in appearance. The density after mechanical compression is 2.52 g/cm3, and this value is likely low. The approximate formula is Mg5(Zn,Mn)3 (CO3)2(OH,Cl)12.H2O. The strongest lines in the X-ray diffraction pattern are 7.47(100), 5.66(20b), 3.038(20), 2.694(60), 2.614(20), 2.515(20), and 1.569(4). It is commonly associated with Mn-Zn species such as hetaerolite, chlorophoenicite, and hodgkinsonite and also with willemite and dolomite. Since the above publication the writer has observed it in numerous occurrences. It is assuredly a new mineral species; only its definition is unclear.
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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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