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 Geigerite

Reset

Geigerite

Geigerite

Named after Dr. Thomas Geiger of Switzerland who stidies the Falotta manganese ores where Geigerite gets its type locality in the Falotta mine in Switzerland. It occurs in two additional localities in the Gozaisho mine on Honshu Island in Japan and at the Monte Negro mine in Liguria, Italy. Geigerite is found formed by the metamorphism of manganese oxide ores in radiolarite cavities.

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

Formula
Mn2+5(AsO4)2(AsO3OH)2ยท10H2
Crystal System
Triclinic 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
red, colorless 
Streak
white 
Class
Triclinic - Pinacoidal 
Hardness
WebMineral
View Geigerite 
Mindat
View Geigerite 

Geigerite from Monte Nero Mine, Rocchetta Vara, La Spezia Province, Italy

Geigerite
            from Monte Nero Mine, Rocchetta Vara, La Spezia Province, Italy

Colorless bladed crystals of Geigerite in flat-lying sprays to 3mm and singular micro-blades on chert matrix with traces of Domekyite, Cuprite and Neotocite.

Click thumbnail images for larger view.

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2021 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map