Avika Natural Black Tourmaline Wrapped Tumble Pendant

DISCLAIMER: No claims are made on metaphysical properties of this stone. These literature is collected from writings, books, folklore and various sources. The actual product may slightly vary from picture as these are natural stone and no two stones can same in pattern.

Chemical Classification          Boron silicate

Color   Black is the most common color. Also occurs in blue, green, yellow, pink, red, orange, purple, brown, and colorless. Single crystals are often zoned.

Streak  White when softer than the streak plate. Colorless when harder than the streak plate.

Luster  Vitreous

Diaphaneity     Transparent to translucent to nearly opaque

Cleavage         Indistinct

Mohs Hardness           7 to 7.5

Specific Gravity          2.8 to 3.3

Diagnostic Properties  Lack of visible cleavage, prismatic crystals with rounded triangular cross-sections that are often striated, vibrant colors, pleochroism.

Chemical Composition            (Ca,Na,K,[vacancy]) (Li,Mg,Fe+2,Fe+3,Mn+2,Al,Cr+3,V+3)3 (Mg,Al,Fe+3,V+3,Cr+3)6 ((Si,Al,B)6O18) (BO3)3 (OH,O)3 (OH,F,O)

Crystal System            Hexagonal

Uses    A popular gemstone and mineral specimen