Macdonaldite is a rare barium silicate mineral with a chemical formula of BaCa4Si16O36(OH)2·10H2O. Macdonaldite was first described in 1965 and named for Gordon A. Macdonald (1911–1978) an American volcanologist at the University of Hawaii.
via Wikipedia infobox
{{Infobox mineral | name = Macdonaldite | category = Phyllosilicate minerals | image = Macdonaldite-356329.jpg | imagesize = 260px | caption = White sprays of macdonaldite and blue botryoidal crust of mcguinnessite | formula = BaCa4Si16O36(OH)2·10H2O | IMAsymbol = Mcd | strunz = 9.EB.05 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Cmcm | unit cell = a = 14.06 Å, b = 23.52 Å, c = 13.08 Å; Z = 4 | color = Colorless, white | habit = Acicular also fibrous, in radiating aggregates; granular | twinning = | cleavage = {010} perfect, {001} good, {100} indistinct | fracture = | tenacity = | mohs = 3.5–4.0 | luster = Vitreous – silky | refractive = nα = 1.518 nβ = 1.524 nγ = 1.530 | opticalprop = Biaxial (+/−), surface relief – low, | dispersion = Weak | birefringence = 0.012 | pleochroism = | 2V = Measured: 90° | streak = White | gravity = 2.27 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent to translucent | other = | references = }} Macdonaldite is a rare barium silicate mineral with a chemical formula of BaCa4Si16O36(OH)2·10H2O. Macdonaldite was first described in 1965 and named for Gordon A. Macdonald (1911–1978) an American volcanologist at the University of Hawaii.
Macdonaldite crystallises in the orthorhombic system. Macdonaldite is anisotropic with low relief.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).