Sections
Thumbnails

Sérandite crystals - click for larger pic
Sérandite crystals
Photo by Violet Anderson
© Royal Ontario Museum

Sérandite crystals - click for larger pic
Sérandite crystals
© Doug Merson

Sérandite crystals - click for larger pic
Sérandite crystals
© Modris Baum

Sérandite crystals - click for larger pic
Sérandite crystals
© Gilles Haineault

Sérandite crystals - click for larger pic
Sérandite crystals
© Quintin Wight

Sérandite crystals - click for larger pic
Sérandite crystals
© Royal Ontario Museum

Search this site

Powered by FreeFind

Home > Mineral Descriptions > Sérandite - (16 Photos)



Sérandite
Na(Mn,Ca)2{Si3O8(OH)}

     Sérandite is certainly a major contributor in making Mont Saint-Hilaire a world famous collecting site and is arguably the most sought after mineral from the site. Three significant finds ('73, '81 and '88) have produced superb, aesthetic specimens up to 20cm in length.

     Sérandite is the Mn end-member of the pectolite-schizolite-sérandite series and very close in being the pure end-member.

PHYSICAL CHARACTERISTICS:

Color ranges from pale pink to salmon-red, rose-red, deep orange, brown
   and black; rarely in smaller crystals as colorless to tan or white.
Luster is vitreous to greasy to dull.
Diaphaneity is transparent to translucent in smaller specimens and
   translucent to opaque on larger crystals; fibrous on aggregates.
Crystal System is triclinic; P1.
Crystal Habits include prismatic and tabular crystals to 20cm; acicular
   to blocky to bladed forming radiating clusters and rarely as fibrous
   aggregates.
Cleavage {001} and {100} are perfect.
Fracture is uneven.
Hardness is 5 - 5.5
Specific Gravity is approximately 3.35 g/cm3.
Streak is white.
Associated Minerals include aegirine, albite, analcime, ancylite,
   astrophyllite, behoite, birnessite, calcite, fluorite, leucophanite,
   mangan-neptunite, natrolite and pyrochlore.
Distinguishing Features: Crystal habit and color.
Origin: Named in 1931 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.

CLASSIFICATION:

Dana System
# 65.2.1.5

Strunz Classification
# VIII/F.18-80

REFERENCES:
MinRec 21:335-338 (1990), Dana 8:1320 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
¤¤

AP
¤¤

MX
¤¤

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

Legend

Sérandite crystals - click for larger pic
Sérandite crystals
© Quintin Wight

Sérandite crystals - click for larger pic
Sérandite crystals
© Stephan Wolfsried

Sérandite crystals - click for larger pic
Sérandite crystals
© Stephan Wolfsried

Sérandite crystals - click for larger pic
Sérandite crystals

Sérandite crystals - click for larger pic
Sérandite crystals
© Quintin Wight

Sérandite crystals - click for larger pic
Sérandite crystals
© Jason B. Smith

Sérandite crystals - click for larger pic
Sérandite crystals
© Steven Stuart

Sérandite crystals - click for larger pic
Sérandite crystals
Photo by R. Lavinsky
© www.irocks.com

Sérandite crystals - click for larger pic
Sérandite crystals
Photo by R. Lavinsky
© www.irocks.com

Sérandite crystals - click for larger pic
Sérandite crystals
Photo by R. Lavinsky
© www.irocks.com