เฮอร์เดอไรต์

Herderite is a phosphate mineral belonging to the apatite, phosphate group, with formula CaBe(PO4)(F,OH). It forms monoclinic crystals, often twinned and variable in colour from colourless through yellow to green. It forms a series with the more common hydroxylherderite, which has more hydroxyl ion than fluoride.

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Within Vinony's link graph, เฮอร์เดอไรต์ is referenced by 13 other articles, and connects out to Saxony, ultraviolet radiation and digital object identifier.

Vinony files it under Beryllium minerals, Calcium minerals and Fluorine minerals.

Its subject is documented across 12 Wikipedia language editions.

Key facts

Mineral.name: Herderite
Mineral.image: Herderite-gem7-08a.jpg
Mineral.category: Phosphate mineral
Mineral.formula: CaBe(PO4)(F,OH)
Mineral.IMAsymbol: Hrd
Mineral.strunz: 8.BA.10
Mineral.system: Monoclinic
Mineral.class: Prismatic (2/m) (same H-M symbol)
Mineral.symmetry: P21/a
Mineral.unit cell: a = 4.81, b = 7.7, c = 9.82 [Å]; β = 90.1°; Z = 4
Mineral.colour: Colourless, pale yellow, greenish-white
Mineral.habit: Occurs as prismatic tabular crystals, pseudo-orthorhombic or pseudo-hexagonal; fibrous botryoidal to spheroidal aggregates
Mineral.twinning: On {100} or {001} as fishtail contact
Mineral.cleavage: Indistinct on {110}
Mineral.fracture: Subconchoidal
Mineral.mohs: 5 - 5.5
Mineral.lustre: Vitreous
Mineral.diaphaneity: Transparent - translucent