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TOURMALINE
Hardness: 7-7.5    Toughness: Good   RI: 1.61-1.74   SG:3.00-3.20   Cleavage: none
Chemical: (Na Li Ca)(Fe11 Mg Mn Al)3Al6((OH)4(BO3)3Si6O18) Crystal System: trigonal Color: white to black with green, blue and pink most popular. Paraiba tourmaline (Brazil) boasts amazingly vivid, almost electric, neon blue colors but has very limited supply.
Sources: Brazil, Sri Lanka, Malagasy Republic, Mozambique, and others. Enhancements: heating
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