Name:

boltwoodite (Nenadkevite)

A photo of the mineral boltwoodite

Class:

Silicates

Chemistry:

KH(UO2)(SiO4) ¥ 1.5 H2O

Color(s):

yellow or light yellow. Streak: white

Hardness:

3.5 - 4.0

SpecGrav:

3.6

Fracture:

Cleavage:

perfect 2 directions

Crystal:

Monoclinic - Sphenoidal

Envronment:

alteration areas surriounding hydrated uranyl oxides; also in fractures at some distance from primary uraninite.

Association:

Locals:

| Ca., Ut., USA | England | South Africa | Namibia |

Misc:

Named after Bertram Borden Boltwood of Yale University; who devised the U-->Pb method of measuring geologic time.

Photos
& Locals:

1.) New Method Mine, San Bernardino County, California
2.) New Method Mine, San Bernardino County, California

3.) New Method Mine, San Bernardino County, California
4.) New Method Mine, San Bernardino County, California

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