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A mineral of secondary origin, commonly associated with other secondary copper minerals, it is typically found as glassy botryoidal or rounded masses or bubbly crusts, and as jackstraw mats of tiny acicular crystals or tufts of fibrous crystals. Copper-bearing allophane can look similar.
The name was first used by Theophrastus in 315 B.C. and comes from the Greek chrysos, meaning "gold," and kolla, meaning "glue," in allusion to the name of the material used to solder gold. André-Jean-François-Marie Brochant de Villiers revived the name in 1808.
Lustre: Vitreous, Waxy, Earthy Transparency: Translucent, Opaque Colour: Green, bluish green, blue, blackish blue to black, or brown and rarely yellow Streak: Light green Hardness: 2½ - 3½ on Mohs scale. Tenacity: Brittle Cleavage: None Observed None Fracture: Irregular/Uneven, Sub-Conchoidal Density: 1.93 - 2.4 g/cm3 (Measured)
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O Elements listed: Al, Cu, H, O, Si
Crystal System: Orthorhombic Cell Parameters: a = 5.7 Å, b = 8.9 Å, c = 6.7 Å Unit Call V: 339.89 Å³ (Calculated from Unit Cell) Morphology: Most often found as cryptocrystalline to amorphous botryoidal aggregates and crusts. Crystals reported as fine acicular to fibrous, very rare Twinning: None reported