mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Mineralpedia Details for Microlite

Reset

Microlite

Microlite

Refers to a group of minerals, named for the Greek word micros, meaning “small,” as the crystals from the type locality at Clark Ledge in Massachusetts, USA are typically quite small. Microlite has a few hundred localities but only a few are known for large crystals. It occurs in lithium rich granite pegmatites including here in the Black Hills of South Dakota in the Tin Mountain, Shamrock No. 1, White Cap (King Lithia), Peerless, and Bob Ingersoll mines in the United States. Microlite can also be found replacing tantalum minerals in these pegmatites and in crystal lined granite cavities. On occasion, Microlite can be radioactive.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/microlite.pdf

Formula
(Na,Ca)2Ta2O6(O,OH,F) 
Crystal System
Isometric 
Crystal Habit
Disseminated, Pseudo Octohedral 
Cleavage
Indistinct, Indistinct, Indistinct 
Luster
Vitreous - Resinous 
Color
yellowish brown, reddish brown, greenish brown, green, gray 
Streak
light yellow 
Class
Isometric - Hexoctahedral 
Fracture
Sub Conchoidal 
Hardness
5-5.5 
WebMineral
View Microlite 
Mindat
View Microlite 

Microlite from Ipe mine, Governador Valaderas, Minas Gerais, Brazil

Microlite
            from Ipe mine, Governador Valaderas, Minas Gerais, Brazil

Glassy orange fine octahedral crystals from 0.5 to 1mm associated with green crystals of Muscovite on Albite matrix.

Gemmy, octahedral micro crystals to 0.75mm on cleavelandite matrix.

Glassy orange, octahedral crystals from 1-2mm, twinned.

Click thumbnail images for larger view.

Microlite from Harding mine, Taos Co., New Mexico, United States

Microlite
            from Harding mine, Taos Co., New Mexico, United States

Yellow crystal grains to 1.5mm throughout purple Lepidolite matrix.

Click thumbnail images for larger view.

Microlite from Hollister quarry, near South Glastonbury, Hartford Co., Connecticut, United States

Microlite
            from Hollister quarry, near South Glastonbury, Hartford Co., Connecticut, United States

Brown 6mm rounded crystal.

Click thumbnail images for larger view.

Microlite from Rutherford mines, Amelia Co., Virginia, United States

Microlite
            from Rutherford mines, Amelia Co., Virginia, United States

Well-formed, very nice 4mm complex crystal. 

Click thumbnail images for larger view.

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2022 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map