Heulandite

saf-ahyuh r

Heulandite is a zeolite mineral named for Johann Heinrich "John Henry" Heuland. Crystals are often bladed with a pearly luster.

Heulandite Rough
Heulandite Classification
Common Name Heulandite
Species Heulandite
Heulandite Optical Properties
Transparency Translucent-Transparent
Refractive Index 1.476-1.517
Birefringence 0.003- 0.011
Optic Character Biaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG)
Fluorescence SWUV: Red, Greenish Yellow
LWUV: Greenish Blue or Greenish Yellow
Heulandite Characteristic Physical Properties
Hardness 3.5-4
Streak Colorless
Specific Gravity 2.200
Luster Vitreous, Pearly
Fracture Uneven, Brittle
Cleavage Perfect
Heulandite Chemistry & Crystallography
Chemical Name Hydrous Calcium Sodium Aluminum Silicate
Chemical Formula (Ca,Na)2-3Al3(Al,Si)2Si13O36 ยท 12H2O
Crystal System Monoclinic
Chemistry Classification Silicate

Heulandite Colors

  • Pink Heulandite Pink
  • White Heulandite White
  • Gray Heulandite Gray
  • Colorless Heulandite Colorless
  • Red Heulandite Red
  • Yellow Heulandite Yellow
  • Brown Heulandite Brown
  • Green Heulandite Green
  • Black Heulandite Black

Alternate Names

Beaumontite, Lincolnite

Countries of Origin

Angola; Cyprus; Kazakhstan; Portugal; Iceland; Greece; Austria; El Salvador; Brazil; Slovenia; Chile; Lesotho; Ecuador; Argentina; United States of America (the); Hungary; Japan; Ukraine; Taiwan (Province of China); India; New Zealand; Canada; Turkey; Belgium; Namibia; Finland; Faroe Islands (the); Italy; South Africa; Antarctica; Peru; Ethiopia; Germany; Tanzania, United Republic Of; Viet Nam; Czechia; Madagascar; Costa Rica; Sweden; China; Ireland; Russian Federation (the); Poland; Slovakia; Bulgaria; France; Jordan; United Kingdom of Great Britain and Northern Ireland (the); Romania; Uruguay; Kenya; Switzerland; Spain; Azerbaijan; Nicaragua; Saint Lucia; Norway; Mexico; Zimbabwe; Philippines (the); Australia; Greenland

Care

Specimens need to be handled with care. Heulandite is easily soluble in hydrochloric acid.

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.