Stringhamite, CuCaSiO4·2H2O, is a new mineral species found in the Bawana mine at the southern end of the Rocky Range, Beaver County, Utah. The mineral occurs as crystals and botryoidal fracture fillings in a diopside-magnetite skarn and is associated with thaumasite, tenorite, kinoite, and calcite.

The space group is P21/c with a0 = 5.028, b0 = 16.07, c0 = 5.303Å, and β = 102.58°. The five strongest powder diffraction lines are: 8.05 (35), 3.928 (34), 3.236 (39), 2.768 (100), and 2.523 (40).

Crystals are monoclinic and are dominated by {011} and {101}, with {010} and {111} also present. The color is azurite blue and the mineral is transparent to translucent. Crystals are biaxial (+) with α = 1.709 (light grey blue), β = 1.717 (light blue), and γ = 1.729 (dark blue); 2Vcalc = 80°; X = b and Y ∧ c = 2.5°.

The mineral is named in honor of Bronson F. Stringham (1907-1968), late chairman of the Department of Mineralogy at the University of Utah.

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