Mordenite Value, Price, and Jewelry Information

Rob Lavinsky, iRocks.com – CC-BY-SA-3.0 [CC-BY-SA-3.0], via Wikimedia Commons

Mordenite

Compact, fibrous material is cabbed because the fibers provide a chatoyancy that sometimes yields weak catseyes. Coloration in the material is due to staining. This is a relatively unexciting mineral, and gems are equally uninspiring. Nevertheless, it has been reported as being cut for collectors.

Mordenite Information

Data Value
Name Mordenite
Is a Variety of Zeolite
Crystallography Orthorhombic. Crystals prismatic; fibrous, cottony, compact.
Refractive Index 1.472-1.487
Colors Colorless, white; stained yellowish, pinkish.
Luster Vitreous to silky.
Hardness 4-5
Fracture Conchoidal
Specific Gravity 2.12-2.15
Birefringence 0.005
Cleavage Perfect 1 direction
Stone Sizes Cabochons can be cut from nodules that reach a size of about 1 inch. Faceted gems have not been reported.
Luminescence None.
Luminescence Present No
Transparency Transparent to translucent.
Absorption Spectrum Not diagnostic.
Phenomena Chatoyancy.
Formula (Ca,Na2,K2)(Al2Si10)O24 7H2O
Pleochroism None.
Optics a = 1.472-1.483; β = 1.475-1.485; γ = 1.477-1.487. Biaxial (+), 2V = 76-104°. Also optically (-).
Optic Sign Biaxial +, Biaxial -

Occurrence: In veins and cavities in igneous rocks; also forms as hydration product of natural glasses.

California; Idaho; Utah; Colorado; Wyoming.

Nova Scotia; Canada; Scotland; Iceland; Italy; India: Russia; Japan; New Zealand.

Comments: Compact, fibrous material is cabbed because the fibers provide a chatoyancy that sometimes yields weak catseyes. Coloration in the material is due to staining. This is a relatively unexciting mineral, and gems are equally uninspiring. Nevertheless, it has been reported as being cut for collectors.

Name: From the locality at Morden, King’s County, Nova Scotia, where first found.

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