Serandite

Sérandite is named after J.M. Sérand, mineral collector of West Africa who helped in the collection of the mineral on the island of Rouma, Los Archipelago, Guinea.

Sérandite forms transparent rose-red, orange or salmon-pink elongated prismatic crystals.

Sérandite is faceted into exceptionally beautiful gems.
General Information
Chemical Formula
Na(Mn
2+
 
,Ca)
 
2
Si
 
3
O
 
8
(OH)
Michael O’Donoghue, Gems, Sixth Edition (2006)
Photos of natural/un-cut material from mindat.org
Physical Properties of Serandite
Mohs Hardness5 to 5.5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity3.52
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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FractureUneven
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Serandite
Refractive Index1.672 to 1.708
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterBiaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.036
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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DispersionModerate
Anthony et al, Handbook of mineralogy (2001)
Colour
Colour (General)Pink-orange
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous,Silky,Greasy,Dull (Earthy)
Anthony et al, Handbook of mineralogy (2001) Vitreous to greasy; fibrous aggregates are dull to silky.
Crystallography of Serandite
Crystal SystemTriclinic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitElongated prismatic
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Sérandite occurs in pegmatites cutting syenites and nepheline syenites in an intrusive alkalic gabbro-syenite complex.
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Further Information
Mineral information:Serandite information at mindat.org
Significant Gem Localities
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
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