From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Category Sorosilicate
(repeating unit)
Strunz classification 9.BH.10
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group P21/m
Unit cell a = 6.99, b = 12.88
c = 5.65 [Å]; β = 96.18°; Z = 2
Color Transparent deep blue
Cleavage excellent {010}, distinct {001} and {100}
Mohs scale hardness2 12
Luster Vitreous
Diaphaneity Transparent
Specific gravity 3.13 - 3.19
Optical properties Biaxial (-)
Refractive index nα = 1.638 nβ = 1.665 nγ = 1.676
Birefringence δ = 0.038
Pleochroism Strong
2V angle Measured: 68° , calculated: 64°
Dispersion relatively weak

Kinoite (Ca2Cu2Si3O8(OH)4[1][2] or Ca2Cu2Si3O10·2H2O[3]) is a light blue copper silicate mineral. It is somewhat scarce. It has a monoclinic crystal system, vitreous luster, and is transparent to translucent. It can be found in the Santa Rita Mountains, the Christmas Mine at Christmas, Arizona and a few other copper mines. Kinoite is popular with mineral collectors. Kinoite was named upon its discovery in 1970 after the pioneer Jesuit missionary Padre Eusebio Kino who worked in Arizona, Sonora and Baja California.