Sprays of acicular crystals on matrix from Bauhaus, Richelsdorf mining district Germany From an old German collection - 1985 Matrix size : 8 x 5 x 5 cm. - Weight : 188 gr - Crystal Sizes : 5 mm ............. Formula:Ca4Mg(AsO4)2(HAsO4)2 · 11H2OColour:White; colorless in transmitted light.Lustre:Sub-Vitreous, Silky, PearlyHardness:1 - 2Specific Gravity:2.55 - 2.64Crystal System:TriclinicName:Named by Friedrich Stromeyer in 1819 from the Greek πικροζ = bitter in allusion to its composition, containing magnesia, and φάρμακον ("pharmakon"), a substance with potent properties (a poison, but may also mean a drug or medicine; cf. pharmacy, pharmaceutical etc.) Picropharmacolite is not structurally related to pharmacolite despite its name as well as the chemical and physical similarity.Type Locality:ⓘ Ore dumps, Richelsdorf Smelter, Süß, Nentershausen, Hersfeld-Rotenburg, Kassel Region, Hesse, Germany Usually found as small to microscopic pearly white botryoids with a radiating structure internally, also commonly as silky fibrous aggregates or small acicular crystals. From Mindat.org