Magnesioclinoholmquistite

General Information: Chemical Formula:Li2(Mg,Fe++)3Al2Si8O22(OH)2 Composition:(Molecular Weight = 846.07 gm)Lithium 1.64 % LiAluminum 6.38 % AlIron 19.80 % FeSilicon 26.56 % SiHydrogen 0.24 % H Oxygen 45.38 % O  Empirical Formula: Li2Fe2+3Al2(Si8O22)(OH)2 Environment:Crystals in a pegmatite. Dimorphous with magnesioholmquistite, forms a series with clinohomquistite and ferroclinoholmquistite. IMA Status:Approved IMA Locality:Unspecifed locality in Siberia, Russia. Name Origin:Named for its composition, monoclinic crystal structure, and relationship with holmsquisite.Physical Properties: Cleavage:[???] Good Color:blue violet, gray, gray violet, or light blue. Density:3.02 Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., , Hardness:5-6 - Between Apatite and OrthoclaseMore details...