Stringhamite

IMA formula: CaCu(SiO₄) · H₂O

Crystallography: Monoclinc. P2₁/c. a = 5.028 (5) Å, b = 16.07 (2) Å, c = 5.303 (6) Å, β = 102.58 (9)°. Z = 4.

Specimen #162. Stringamite (deep blue), xenotite (white tufts), apophyllite group (colorless block crystals), and grossular (yellow). Christmas Mine, Christmas, Banner Mining District, Gila County, Arizona, USA. FOV 4.4 mm.