Spurrite Value, Price, and Jewelry Information


Spurrite
By Trtrtr (original) [Public domain], via Wikimedia Commons

This attractive but rather rare mineral has seldom been cut as a gemstone. Polished slabs and rough material appeared in 1986 at a mineral show in substantial quantities, however. This material is Mexican, translucent to opaque, and medium to dark purple in color.

Spurrite Value

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

Spurrite Information

DataValue
NameSpurrite
Crystallography Monoclinic. Crystals anhedral; usually massive, granular.
Colors Gray, lavender-gray, purple.
Luster Vitreous. Translucent.
Hardness 5.
Specific Gravity 3.0.
Birefringence 0.039.
Cleavage Distinct 1 direction.
Dispersion Not reported.
Luminescence Not reported.
Spectral Not reported.
FormulaCa­5Si2O8CO3
Pleochroism Not reported.

Optics: a = 1.640; β= 1.674; γ=1.679.

Biaxial (-), 2V= 40°.

Occurrence: A contact mineral in limestones.

Crestmore, California; Tres Hermanes, New Mexico.

Scawt Hill, County Antrim, Ireland.

Velardena mining district, Durango, Mexico.

Comments: This attractive but rather rare mineral has seldom been cut as a gemstone. Polished slabs and rough material appeared in 1986 at a mineral show in substantial quantities, however. This material is Mexican, translucent to opaque, and medium to dark purple in color.

The hardness and tenacity are adequate for use as cabochons.

Name: After the American geologist, Josiah Edward Spurr.