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Cannonite, Bi 2 O(OH) 2 SO 4 , a new mineral from Marysvale, Utah, USA by Stanley, C. J.; Roberts, A. C.; Harris, D. C.; Criddle, A. J.; Szymañski, J. T. is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract Cannonite, ideally Bi~2~O(OH)~2~SO~4~, is a new mineral from the Tunnel Extension mine, Ohio Mining District, Marysvale, Utah, USA. It occurs mostly as intergrown crystalline aggregates (<1 mm) of subhedral to euhedral equant to prismatic crystals (<200 μm) in cavities in quartz gangue. Other associated minerals are cuprobismutite, bismuthinite, and covelline. Cannonite is colourless and transparent with an adamantine lustre and white streak. It is brittle with an uneven to conchoidal fracture. In reflected light it is low reflecting, weakly to moderately bireflectant and weakly anisotropic. Internal reflections (colourless to white) are abundant. Measured reflectance values in air and oil are tabulated. Colour values relative to the CIE illuminant C for R~1~ and R~2~ in air respectively are: Y% 10.4, 11.7; Lambda~d~ 475,475; Pe% 2.6, 3.0. Calculated refractive indices at 589 nm: R1 1.91 and R2 1.99. VHN~100~ 229 (range 183-280); calculated Mohs hardness is 4. X-ray studies show that cannonite is monoclinic with space group P2~1~/c and a 7.700(3), b 13.839(6), c 5.686(2) Å, β 109.11(3) ° It has a cell volume of 572.5(4) Å^3^ with Z = 4. D~calc~. is 6.515 g/cm^3^. The st

Who reads Cannonite, Bi 2 O(OH) 2 SO 4 , a new mineral from Marysvale, Utah, USA?

Author

Stanley, C. J.; Roberts, A. C.; Harris, D. C.; Criddle, A. J.; Szymañski, J. T.

Publisher

The Mineralogical Society; Mineralogical Society (ISSN 0026-461X)

Published

1992

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)