Chemical Formula:  KPb26Ag9Cu24(OH)48Cl62

Chemical Composition:  Potassium lead silver chloride hydroxide

Crystal System:  Cubic (Isometeric)

Mineral Class:  Halide

Hardness:  3 — 3.5

Density/Specific Gravity:  5.05  

Refractive Index:  2.03 — 2.05

Double Refraction:  None

Absorption Spectra:  701, 693, 640, 622, 443

Colour:  Streak blue, indigo-blue, deep blue

Pleochroism:  None

Transparency:  Transparent to subtranslucent

Lustre:  Vitreous (glassy), pearly (pearl like lustre) 

Luminescence:  None

Cleavage:  Perfect

Fracture:  Uneven 

Countries:  Primary source is from the Amelia Mine, Santa Rosalia, Boleo District, Baja California Sur, Mexico. Other locations include
Australia, Chile, England, Germany, Greece, Iran, Russia, USA. 

Notes:  A very soft mineral measuring 3 — 3.5 on the Mohs scale 

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