Serandite Value, Price, and Jewelry Information

Rectangle-cut serandite, 1.87 cts, 10.0 x 5.0 x 3.0 mm, Mont St. Hilaire, Quebec, Canada. © Rob Lavinsky, www.iRocks.com. Used with permission.

Serandite

To date, only one locality — Mont St. Hilaire, Quebec, Canada — has produced facetable serandite. These extremely rare gems are very small and usually cut from less than transparent crystal fragments.

Serandite Value

baguette-cut serandite - Canada

Baguette-cut serandite, 0.50 cts, 6.1 x 3.4 x 2.5, Mont St. Hilaire, Quebec, Canada. © ARK Rare Gems. Used with permission.

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

Serandite Information

Data Value
Name Serandite
Crystallography Triclinic. Crystals prismatic in appearance, stubby, well-formed.
Refractive Index 1.660-1.705
Colors Rose red, pinkish, salmon red, orange, brown, black, colorless (in thin sections).
Hardness 4.5-5.5
Fracture Uneven
Birefringence 0.028-0.045
Cleavage Perfect 1 direction
Luminescence None
Luminescence Present No
Absorption Spectrum Not diagnostic
Formula Na(Mn,Ca)2Si3O8(OH)
Optics α = 1.660-1.680; β = 1.664-1.682; γ = 1.688-1.705. Biaxial (+); 2V= 35°.
Optic Sign Biaxial +
Luster Vitreous, pearly on cleavage.
Specific Gravity 3.32
Transparency Transparent to translucent
Etymology Named after J. M. Sérand, West African mineral collector.
Occurrence In nepheline syenite rocks.
serandite gem and rough - Canada

Serandite, Mont St. Hilaire, Quebec, Canada (gemstone around 1.5 cts, rough approximately 2 inches long). Photo © Joel E. Arem, PhD, FGA. Used with permission.

Comments

Serandite (formerly spelled “sérandite”) forms a mineral series with pectolite. Serandite is the manganese (Mn) end member, while pectolite is the calcium (Ca) end member. Of the two, serandite is the rarest by far.

Identifying Characteristics

The refractive indices (RI) of the pectolite-serandite series vary with the presence of Ca and Mn.

pectolite-serandite series RI

Chart © Joel E. Arem, PhD, FGA. Used with permission.

Schizolite (formerly “marshallsussmanite”) is an intermediate member of this series.

Synthetics

Scientists have synthesized serandites for research purposes. However, there’s no known jewelry use for this material.

Enhancements

No known gemstone treatments or enhancements.

rectangular step-cut serandite - Canada

Rectangular step-cut serandite, 0.50 cts, 7 x 3.1 mm, Mont St. Hilaire, Quebec, Canada. © The Gem Trader. Used with permission.

Sources

Although serandite occurs in numerous locales across the globe, it remains a rare mineral. Only Mont St. Hilaire in Quebec, Canada has produced cuttable material, but even large crystals found here seldom have transparent, facetable areas. 

Rouma Isle, Los Islands, Guinea is the type locality for this mineral.

Other sources include the following locations:

  • United States: Arkansas; California; New Mexico.
  • Japan; Russia; South Africa.

Stone Sizes

Cut serandites very rarely weigh more than 2-3 carats. In fact, faceted gems of any size are very rare.

  • Smithsonian Institution (Washington, DC): 2+ (Quebec). 
  • Private Collection: 5+ (flawed).
  • National Museums of Canada (Ottawa, Ontario): 18.65, 2.8 (translucent).

Care

You’re more likely to find serandites, if at all, in mineral collections than jewelry collections. With a hardness of 4.5 to 5.5 and perfect cleavage, this gem would require protective jewelry settings to reduce the risk of scratches and blows. Reserve this rare gem for occasional wear or for earrings, brooches, or other pieces less subject to impacts.

Clean these gems only with a soft brush, mild detergent, and warm water. Consult our gemstone jewelry cleaning guide for more care recommendations.

serandite cabochon - Canada

Oval cabochon serandite, 4.85 cts, 18 x 9.6 mm, Mont St. Hilaire, Quebec, Canada. © The Gem Trader. Used with permission.

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