Geigerite is a mineral, a complex hydrous manganesearsenate with formula: Mn5(AsO3OH)2(AsO4)2ยท10H2O. It forms triclinic pinacoidal vitreous colorless, red to brown crystals. It has a Mohs hardness of 3 and a specific gravity of 3.05. General Name, Symbol, Number manganese, Mn, 25 Chemical series transition metals Group, Period, Block 7, 4, d Appearance silvery metallic Atomic mass 54. ... The arsenate ion is AsO43-. An arsenate (compound) is some compound that contains this ion. ... In crystallography, the triclinic crystal system is one of the 7 lattice point groups. ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... Relative density (also known as specific gravity) is a measure of the density of a material. ...
It was discovered in Grischun, Switzerland in 1989, it is apparently named after the mineral collector Richard M Geiger. It is also found in Liguria, Italy. Liguria is a coastal region of north-western Italy, the third smallest of the Italian regions. ...
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