ALUM (-K)

CLASS: Sulfate . . . CHEMICAL FORMULA: KAl (SO4)2 (H2O)12 . . . CRYSTAL SYSTEM: Isometric
CRYSTAL FORM: octahedron, cube; stalactitic, columnar, granular forms.
COLOR: white, colorless
PHYSICAL PROPERTIES: soft (2 Mohs), light (1,75 g/cm3), fragile, imperfect exfoliation, conchoidal fracture, transparent, vitreous luster, very soluble in water.
CURIOSITIES: it is related to protection against negative energies and attraction of economic bonanza

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