Cafetite

General Information: Chemical Formula:Ca(Fe+++,Al)2Ti4O12·4(H2O) Composition:(Molecular Weight = 598.69 gm)Calcium 6.69 % CaTitanium 31.99 % TiAluminum 1.35 % AlIron 15.86 % FeHydrogen 1.35 % H Oxygen 42.76 % O  Empirical Formula: CaFe3+1.7Al0.3Ti4O12·4(H2O) Environment:In miarolitic cavities in pegmatites cutting pyroxenite. IMA Status:Approved IMA 1959 Locality:Afrikanda massif, Kola Peninsula, Russia. Name Origin:Named for the composition (Ca, Fe, Ti).Physical Properties: Cleavage:[???] Good Color:colorless or pale yellow. Density:3.28 Diaphaniety:Transparent Habits:Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Acicular - Occurs as needle-like crystals., Aggregates - Made of numerous individual crystals or clusters. Hardness:4-5 - Fluorite-Apatite Luster:Adamantine Streak:whiteMore details...