General Information:
Chemical Formula:
K(Ca,Ce)5[Si8O22](OH,F)2
Composition:
(Molecular Weight = 901.19 gm)
Potassium 4.34 % K
Calcium 20.01 % Ca
Cerium 7.77 % Ce
Silicon 24.93 % Si
Hydrogen 0.17 % H
Oxygen 41.72 % O
Fluorine 1.05 % F
Empirical Formula:
KCa4.5Ce0.5Si8O22(OH)1.5F0.5
Environment:
Metamorphosed shale with wollastonite.
Locality:
Wilson Mineral Springs, Arkansas, USA.
Name Origin:
Named for Hugh Dinsmore Miser (1884-1969), geologist, U. S. Geological Survey.
Physical Properties:
Cleavage:
[100] Perfect, [010] Indistinct
Color:
lilac pink, pink, or reddish brown.
Density:
2.84 - 2.93, Average = 2.88
Diaphaniety:
Translucent
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luminescence:
Fluorescent.
Luster:
Vitreous - Pearly
Streak:
white
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