Pectolite

saf-ahyuh r

Pectolite has crystals that are elongated and flattened, but it more often occurs as acicular sprays or radially fibrous masses. It may be white, pale tan, or pale blue to greenish. Pectolite occurs widely in Canada, England, and the United States.

Pectolite Polished
Pectolite Classification
Common Name Pectolite
Species Pectolite
Pectolite Optical Properties
Transparency Semitransparent - Opaque
Refractive Index 1.599-1.628
Tolerance:(+0.017/-0.004)
Birefringence 0.029-0.038
Optic Character Biaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: Inert to strong greenish yellow to orange
LWUV: Inert to moderate greenish yellow to orange
Pleochroism Unobservable
Pectolite Characteristic Physical Properties
Hardness 4.5-5
Specific Gravity 2.740-2.900 Typical:2.810
Toughness Varies
Luster Vitreous, Silky
Fracture Uneven, Splintery
Cleavage Perfect, in two directions
Pectolite Chemistry & Crystallography
Chemical Formula NaCa2Si3O8(OH)
Crystal System Triclinic
Chemistry Classification Silicate

Countries of Origin

United States of America (the); Dominican Republic (the)

Shop Pectolite

Sisk Gemology Reference

Showcasing 200 gemstones in over 1,000 pages and accompanied by more than 2,000 photos, The Sisk Gemology Reference is a must-have in every collector’s library. Each comprehensive, three-volume set features state-of-the-art photography, detailed illustrations, and scientifically precise descriptions to create an entrancing experience for gemstone amateurs and afficionados alike.

Shop Now

 
Tim Matthews

Author

Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.