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|Colour:||Orange, yellow, ...||Hardness:||2½ - 5|
|Name:||In allusion to the gum-like or rubber-like (rubber = gummi in German) appearance of some early material.|
|A Mixture Of:||Boltwoodite, Clarkeite, Curite, Kasolite, Soddyite, Uraninite, Uranophane|
A mixture of uraninite and secondary uranium minerals of variable composition.
Classification of Gummite
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Physical Properties of Gummite
|Lustre:||Vitreous, Waxy, Greasy, Dull|
|Colour:||Orange, yellow, orange-red, red-brown, brown-black, black|
|Streak:||Yellow, brownish, olive-green|
|Hardness (Mohs):||2½ - 5|
|Density (measured):||3.9 - 6.4 g/cm3|
Other Names for Gummite
|Health Warning:||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
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
The 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.