Serandite Value, Price, and Jewelry Information

SERANDITE: Mt. Ste. Hilaire, Quebec, Canada (~1.5, rough ~ 2 inches long). Photo © Joel E. Arem, PhD, FGA. Used with permission.

Sérandite

This essentially is another one locality mineral, where very small gems have been cut from an occasional crystal fragment that is not always even transparent.

Sérandite Information

Data Value
Name Sérandite
Colors Rose red, pinkish, salmon red.
Crystallography Triclinic. Crystals prismatic in appearance, stubby, well formed.
Refractive Index 1.660-1.688
Luster Vitreous, pearly on cleavage.
Hardness 4.5-5
Fracture Uneven
Specific Gravity 3.32
Birefringence 0.028
Cleavage Perfect 1 direction
Stone Sizes Cut serandite over 2-3 carats is very rare. In fact, cut gems of any size are very rare. Cutting material comes only from Quebec, and even large crystals seldom have facetable areas. USNM: 2+ (Quebec). Private Collection: 5+ (flawed). National Museums of Canada (Ottawa, Ontario): 18.65, 2.8 (translucent).
Luminescence None.
Luminescence Present No
Transparency Transparent to translucent.
Absorption Spectrum Not diagnostic.
Formula

Na (Mn,Ca)2Si3O8(OH).

Optics

α = 1.660; β = 1.664; γ = 1.688. Biaxial (+); 2V= 35°.

Optic Sign Biaxial +

SERANDITE Series to Pectolite.

Occurrence: In nepheline syenite rocks at Mt. Ste. Hilaire, Quebec, Canada. Also known from Los Islands, Guinea.

Comments: This essentially is another one locality mineral, where very small gems have been cut from an occasional crystal fragment that is not always even transparent.

Name: For J. M. Sérand, West African mineral collector.