minyulite

{{Infobox mineral | name = Minyulite | category = Phosphate mineral | boxwidth = | boxbgcolor = | image = Minyulite-101599.jpg | imagesize = 260px | caption = Colorless minyulite crystals from Tom's Phosphate quarry, Kapunda, Mount Lofty Ranges, South Australia (Field of view 4 mm) | formula = KAl2(PO4)2F·4(H2O) | IMAsymbol = Myu | molweight = 372.57 g/mol | strunz = 8.DH.05 | system = Orthorhombic | class = Pyramidal (mm2) (same H-M symbol) | symmetry = Pba2 | unit cell = a = 9.34 Å, b = 9.74 Å, c = 5.52 Å; Z = 2 | color = Colorless to white, greenish yellow | habit = Radiating fibrous to prismatic crystals | twinning = | cleavage = {001} Perfect | fracture = Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | tenacity = Brittle | mohs = 3.5 | luster = Vitreous, silky in aggregates | refractive = nα = 1.531 nβ = 1.534 nγ = 1.538 | opticalprop = Biaxial (+) | birefringence = δ = 0.007 | pleochroism = | 2V = Measured: 70°, calculated: 82° | streak = White | gravity = 2.45 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent | other = | references = }}

Minyulite is a rare phosphate mineral with a chemical formula of (redefinition, IMA21-E).