Tourmaline var. Dravite

Tourmaline – Na(Li,Al)₃Al₆Si₆O₁₈(BO₃)₃(OH)₄

Elements: Sodium, Lithium, Aluminum, Silicon, Oxygen, Boron, Hydrogen

Class: Silicates – Cyclosilicates

Crystal System: Hexagonal

Hardness: 7-7.5

Quartz

Talc (1)Diamond (10)

Very hard. Scratches glass and steel.

Dravite – NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

Elements: Sodium, Magnesium, Aluminum, Silicon, Oxygen, Boron, Hydrogen

Class: Silicates – Cyclosilicates

Crystal System: Triclinic

Hardness: 7

Quartz

Talc (1)Diamond (10)

Very hard. Scratches glass and steel.

Origin: Power’s Farm, Pierrepont, St Lawrence Co., New York – Usa

More minerals containing Boron