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Orange, yellow, ...
2½ - 5
In allusion to the gum-like or rubber-like (rubber = gummi in German) appearance of some early material.
A mixture of uraninite and secondary uranium minerals of variable composition.

Classification of Gummite URL:
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Physical Properties of Gummite

Vitreous, Waxy, Greasy, Dull
Diaphaneity (Transparency):
Orange, yellow, orange-red, red-brown, brown-black, black
Yellow, brownish, olive-green
Hardness (Mohs):
2½ - 5
None Observed
Irregular/Uneven, Conchoidal
3.9 - 6.4 g/cm3 (Measured)    

Other Names for Gummite

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Gummite

Reference List:
Breithaupt (1847): 903 (as urangummi).

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 622-624.

Frondel, C. (1956) The mineralogical composition of gummite. American Mineralogist: 41: 539-568.

Internet Links for Gummite

Localities for Gummite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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