Mordenite Value, Price, and Jewelry Information


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

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 Value

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Mordenite Information

DataValue
NameMordenite
Is a Variety ofZeolite
Crystallography Orthorhombic. Crystals prismatic; fibrous, cottony, compact.
Colors Colorless, white; stained yellowish, pinkish.
Luster Vitreous to silky.
Fracture Conchoidal; brittle.
Hardness 4-5.
Specific Gravity 2.12-2.15.
Birefringence 0.005.
Cleavage Perfect 1 direction.
Stone SizesCabochons can be cut from nodules that reach a size of about 1 inch. Faceted gems have not been reported.
Luminescence None.
Spectral Not diagnostic.
Formula(Ca,Na2,K2)(Al2Si10)O24 7H2O
Pleochroism None.

Optics: a = 1.472-1.483; β= 1-4754-435; γ= 1.477-1.487.

Biaxial (+), 2V =76-104°. Also optically (-).

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; Yugoslavia: USSR; 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.