yoshiokaite

{{Infobox mineral | name = Yoshiokaite | category = Tectosilicate | image = Yoshikawaite on serpentine Hydrous basic magnesium carbonate Yoshikawa - Shinoshira shi - Aichi Prefecture Japan 1940.jpg | caption = | formula = (Ca8-(x/2)[]x/2Al16-xSixO32) | IMAsymbol = Yos | molweight = | strunz = 8/J.02-60 | system = Trigonal | class = Rhombohedral () (same H-M symbol) | symmetry = P | unit cell = a = 9.939 Å,c = 8.254 Å | color = Colorless | habit = Devitrified glass | twinning = | cleavage = Poor on {101} | fracture = | tenacity = | mohs = | luster = Vitreous | polish = | refractive = | opticalprop = Uniaxial positive | birefringence = δ=0.060 | dispersion = | pleochroism = | fluorescence= | absorption = | streak = white | gravity = | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = | other = | references = }}

Yoshiokaite, a mineral formed as shocked crystal fragments in devitrified glass, was discovered in lunar regolith breccia collected from a trench by the Apollo 14 crew in 1971. Although there have been other minerals (armalcolite and tranquillityite) that have been originally discovered on the Moon, yoshiokaite is the first new mineral with origin related to lunar highlands. Yoshiokaite is considered to be a member of the feldspathoid group.