Tarbuttite is a rare phosphate mineral with formula Zn2(PO4)(OH). It was discovered in 1907 in what is now Zambia and named for Percy Coventry Tarbutt.
{{Infobox mineral | name = Tarbuttite | category = Phosphate minerals | boxwidth = | boxbgcolor = | image = Tarbuttite.JPG | imagesize = | caption = Tarbuttite from Broken Hill mine (Kabwe mine) in Central Province, Zambia | formula = Zn2(PO4)(OH) | IMAsymbol = Tbt | molweight = | strunz = 8.BB.35 | dana = 41.6.7.1 | system = Triclinic | class = Pinacoidal () (same H-M symbol) | symmetry = P | unit cell = a = 5.400 Å, b = 5.654 Å c = 6.465 Å, α = 102.51° β = 102.46°, γ = 86.50° Z = 2 | color = White, colorless, yellow, red, green, or brown | habit =Equant to short prismatic [001], sheaf-like aggregates, crusts, individual crystals rounded and deeply striated | twinning = | cleavage = Perfect on {010} | fracture = Irregular, uneven | tenacity = | mohs = 3.5 | luster = Vitreous, pearly on cleavages | polish = | refractive = nα = 1.660nβ = 1.705nγ = 1.713 | opticalprop = Biaxial (−) | birefringence = δ = 0.053 | 2V = 50° (measured) | dispersion = Weak, strong | pleochroism = | fluorescence= Non-fluorescent | absorption = | streak = White | gravity = 4.12; 4.19 (calc.) | density = 4.12 g/cm3 (measured) | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent, translucent | other = | references = }}
Tarbuttite is a rare phosphate mineral with formula Zn2(PO4)(OH). It was discovered in 1907 in what is now Zambia and named for Percy Coventry Tarbutt.
via Wikipedia infobox
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).