artinite

{{Infobox mineral | name = Artinite | image = Artinite - Atlas mine1, San Benito, California, USA.jpg | imagesize = 280px | alt = Artinite – Atlas mine, San Benito, California, US | caption = Artinite from New Idria District, California | category = Carbonate mineral | formula = | IMAsymbol = Art | molweight = | strunz = 5.DA.10 | dana = | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = C2/m | unit cell = a = 16.56, b = 3.15 c = 6.22 [Å]; β = 99.15°; Z = 2 | color = White | colour = | habit = Acicular crystals, fibrous veinlets, botryoidal crusts, and spherical aggregates | twinning = | cleavage = On {100} perfect; on {001} good. | fracture = | tenacity = | mohs = 2.5 | luster = Vitreous, silky | streak = White | diaphaneity = Transparent | gravity = 2.01 – 2.03 | density = | polish = | opticalprop = Biaxial (−) | refractive = nα = 1.488 – 1.489 nβ = 1.533 – 1.534 nγ = 1.556 – 1.557 | birefringence = δ = 0.068 | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = }}

Artinite is a hydrated basic magnesium carbonate mineral with formula: . It forms white silky monoclinic prismatic crystals that are often in radial arrays or encrustations. It has a Mohs hardness of 2.5 and a specific gravity of 2.