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Chupa pegmatite field, Northern Karelia, Karelia Republic, Northern Region, Russia
© Pavel M. Kartashov
| Colour: | Orange, yellow, ... | Hardness: | 2½ - 5 |
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| 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 | ||
Classification of Gummite | ||||
| mindat.org URL: | http://www.mindat.org/min-1774.html Please feel free to link to this page. | |||
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Physical Properties of Gummite | ||||
| Lustre: | Vitreous, Waxy, Greasy, Dull | |||
| Diaphaneity (Transparency): | Translucent | |||
| Colour: | Orange, yellow, orange-red, red-brown, brown-black, black | |||
| Streak: | Yellow, brownish, olive-green | |||
| Hardness (Mohs): | 2½ - 5 | |||
| Tenacity: | Brittle | |||
| Cleavage: | None Observed | |||
| Fracture: | Irregular/Uneven, Conchoidal | |||
| Density (measured): | 3.9 - 6.4 g/cm3 | |||
Other Names for Gummite | ||||
| Synonyms: |
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| Other Languages: | ||||
| Varieties: |
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Other Information | ||||
| 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 | ||||
| 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 | ||||
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Localities for Gummite | ||||
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