Danburite

Danburite is a generally colorless crystal that may also be yellow or pink. A white danburite crystal may display a characteristic wedge-shaped end. That is similar to those of colorless topaz but distinguishable by cleavage (poor in danburite, perfect in topaz). Moreover, the specific gravity of danburite is lower.

Occurrence

Danburite was first found in the town of Danbury, Connecticut (USA). Gem-quality crystals occur in Mexico, Myanmar (Burma), Japan, Italy, and Switzerland.

Danburite Properties

• Specific Gravity: 3.00
• Refractive Index: 1.63-1.64
• Birefringence (DR): 0.006
• Luster: Vitreous to greasy
• Crystal Structure: Orthorhombic
• Composition: Calcium borosilicate
• Hardness: 7

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