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Orange, yellow, ...
Vitreous, Waxy, Greasy, Dull
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

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:
Contains uranium - always wash hands after handling. Avoid inhaling dust when handling or breaking. Never lick or ingest. Avoid prolonged exposure in proximity of the body. Store away from inhabited areas.

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 URL:
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Localities for Gummite

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