Spurrite Value, Price, and Jewelry Information

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

Spurrite

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 Information

Data Value
Name Spurrite
Formula Ca­5Si2O8CO3
Colors Gray, lavender-gray, purple.
Fracture Uneven to splintery
Hardness 5
Cleavage Distinct 1 direction
Crystallography Monoclinic. Crystals anhedral; usually massive, granular.
Refractive Index 1.640-1.679
Birefringence 0.039
Luminescence Not reported.
Luminescence Present No
Absorption Spectrum Not reported.
Pleochroism Not reported.
Optics a = 1.640; β = 1.674; γ = 1.679. Biaxial (-), 2V= 40°.
Optic Sign Biaxial -
Luster Vitreous.
Specific Gravity 3.0
Transparency Transparent to opaque.

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.

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