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Delmoe Lake area, Boulder Batholith, Jefferson Co., Montana, USA

Cleavelandite
Delmoe Lake area, Boulder Batholith, Jefferson Co., Montana, USA

Photo: W.C. van Laer, 2009
Delmoe Lake, a reservoir located approximately 10 miles north of Homestake Pass in Jefferson County, Montana, is part of the larger mass of the Boulder Batholith and contains numerous bodies and segregations of aplite, grano-aplite, and alaskaites. These occasionally grade locally into coarse pegmatite or graphic granite, and then into vugs or cavities. The vugs contain anhedral to euhedral crystals of the characteristic granite minerals, i.e., quartz, feldspar, and mica minerals.

Mineral List

Albite
var: Cleavelandite
'Axinite Group'
Cosalite
Epidote
Hematite
Microcline
Muscovite
Muscovite
var: Sericite

Quartz
var: Amethyst
var: Sceptre Quartz
Quartz
var: Smoky Quartz

Schorl
Spessartine
Topaz


16 entries listed. 10 valid minerals.

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References

(William C. van Laer, in preparation)

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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