Mineral description : Margarosalite

Surface of margarosalite from Jakobsberg. (Size 6x4x3 cm)

Mineral class	Silicates : Inosilicates : Wollastonite group
Chemical formula	Pb(Ca,Mn)2Si3O9
Crystal system	Triclinic
Habitus	As masses or thin plates.
Cleavage	Perfect in one direction {010}, good on {100}, fair on {001}, brittle conchoidal smooth uneven splintery-->
Hardness	2.5 - 3
Density	4.33
Color	Colorless to white.
Streak	White.
Luster	Pearly on cleavages.
Description
Occurance
Associates
Notes	Strong bluish white fluorescense in short wave UV (rarely read to pink). Type locality: Franklin, Sussex Co, New Jersey, USA. Because of the cleavage, fragments are showing a rhombic form. Named after Greec words for pearly (Margariotes = pearls) and the crystal form (Sanis = plate or board).
Localities	Sweden : Långban, Värmland. In druses and fractures in schefferite scarn or hausmannite impregnated dolomite. Jakobsberg, Nordmark, Värmland. In fractures with richterite and garnet. Norway : No known localities. Finland : No known localities.

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