Cannonite, Bi2O(OH)2SO4, a New Mineral from Marysvale, Utah, USA*

C. J. Stanley1, A. C. Roberts2, D. C. Harris2, A. J. Criddle1 and J. T. Szymański3
1 Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
2 Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, K1A 0E8, Canada
3 CANMET, 555 Booth Street, Ottawa, Ontario, K1A 0G1, Canada
*Geological Survey of Canada Contribution Number 16192.

Abstract: Cannonite, ideally Bi2O(OH)2SO4, 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 R1 and R2 in air respectively are: Y% 10.4, 11.7; Lambdad 475,475; Pe% 2.6, 3.0. Calculated refractive indices at 589 nm: R1 1.91 and R2 1.99. VHN100 229 (range 183–280); calculated Mohs hardness is 4.

X-ray studies show that cannonite is monoclinic with space group P21/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) Å3 with Z = 4. Dcalc. is 6.515 g/cm3. The strongest six lines of the X-ray powder pattern are [d in Å (I) (hkl)] 3.206 (100) (2¯21); 1.984 (90) (340, 1¯52); 2.924 (70) (131); 3.644 (60) (111); 3.466 (60) (040); 2.782 (50) (1¯12). Averaged probe analyses gave the empirical formula Bi1.99O(OH1.04)2S0.99O4 on the basis of 7 oxygen atoms. The name is for Benjamin Bartlett Cannon of Seattle, Washington, United States of America.

Keywords: cannonite • new mineral • bismuth • Marysvale • Utah

Mineralogical Magazine; December 1992 v. 56; no. 385; p. 605-609; DOI: 10.1180/minmag.1992.056.385.17
© 1992, The Mineralogical Society
Mineralogical Society (