veatchite

{{Infobox mineral | name = Veatchite | boxwidth = | image = Veatchite.jpg | imagesize = 260px | alt = | caption = Veatchite-p, Billie Mine, Death Valley, California | category = Phylloborates | formula = Sr2B11O16(OH)5 · H2O | IMAsymbol = Vea | strunz = 6.EC.15 | dana = | system = Monoclinic | class = Domatic (m) (same H-M symbol) | symmetry = Aa | unit cell = a = 20.81 Å, b = 11.74 Å c = 6.63 Å; β = 92.03°; Z = 8 | color = Colorless to white | habit = Flattened platey to prismatic crystals, diverging fibrous clusters and cross fiber veinlets | twinning = | cleavage = Perfect on {010}, indistinct on {001} | fracture = | tenacity = | mohs = 2 | luster = Vitreous to pearly | streak = | diaphaneity = Transparent to translucent | gravity = 2.62 | density = | polish = | opticalprop = Biaxial (+) | refractive = nα = 1.551 nβ = 1.553 nγ = 1.620 | birefringence = δ = 0.069 | pleochroism = | 2V = Measured: 37° | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = }}

Veatchite is an unusual strontium borate, with the chemical formula Sr2B11O16(OH)5·H2O. There are two known polytypes, veatchite-A and veatchite-p.