Englishite

General Information: Chemical Formula:K3Na2Ca10Al15(PO4)21(OH)7·26(H2O) Composition:(Molecular Weight = 3,550.62 gm)Potassium 3.30 % K Sodium 1.29 % NaCalcium 11.29 % CaAluminum 11.40 % AlPhosphorus 18.32 % P Hydrogen 1.67 % H Oxygen 52.72 % O  Empirical Formula: K3Na2Ca10Al15(PO4)21(OH)7·26(H2O) Environment:In variscite nodules. Locality:Clay Canyon, Fairfield, Utah CounTy, Utah, USA. Name Origin:Named for George L. English (1864-1944), American mineral dealer and collector.Physical Properties: Cleavage:[001] Perfect Color:colorless or white. Density:2.68 Diaphaniety:Transparent to Translucent Habits:Micaceous - Platy texture with "flexible" plates., Aggregates - Made of numerous individual crystals or clusters., Friable - Loosley cohesive material that granulates with your finger s. Hardness:3 - Calcite Luminescence:Non-fluorescent. Luster:Vitreous - Pearly Streak:whiteMore details...