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Name: |
boltwoodite (Nenadkevite) |
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Class: |
Silicates |
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Chemistry: |
KH(UO2)(SiO4) ¥ 1.5 H2O |
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Color(s): |
yellow or light yellow. Streak: white |
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Hardness: |
3.5 - 4.0 |
SpecGrav: |
3.6 |
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Fracture: |
Cleavage: |
perfect 2 directions |
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Crystal: |
Monoclinic - Sphenoidal |
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Envronment: |
alteration areas surriounding hydrated uranyl oxides; also in fractures at some distance from primary uraninite. |
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Association: |
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Locals: |
| Ca., Ut., USA | England | South Africa | Namibia | |
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Misc: |
Named after Bertram Borden Boltwood of Yale University; who devised the U-->Pb method of measuring geologic time. |
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