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Mineralpedia Details for Serandite

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Serandite

Serandite

More properly spelled Sérandite, this mineral is named for West African mineral collector J.M Sérand who also assisted in the collection of the type material from Rouma Island of Guinea. Occurs in several environments including in sodalite xenoliths and pegmatites that cut syenite and nepheline syenites in pegmatite, in phonolite vugs, and in volcanogenic manganese deposits affected by contact metamorphism.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/serandite.pdf

Formula
NaMn2+2Si3O8(OH) 
Crystal System
Triclinic 
Crystal Habit
Prismatic 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous - Pearly 
Color
light brown, light pink, orange red 
Streak
white 
Class
Triclinic - Pinacoidal 
Hardness
4.5-5.5 
WebMineral
View Serandite 
Mindat
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Serandite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Serandite
            from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Salmon pink crystals the largest is a tabular crystal to 1cm.

Pink cluster of Serandite crystals, mostly in parallel growth. The crystals on the front are to about 1.5cm. All the crystals are cavernous - are hollow. Serandite is the Mn end member of Pectolite. The white mineral is Albite.

Very nice long thin blade of salmon-pink Serandite with smaller bladed Serandite crystals to 1.5cm and red-orange stubby prismatic Mangan-neptunite crystals to 2mm. Overall 11.5 x 0.7 x 3cm.

Salmon colored thick tabular crystal, doubly terminated to 5.5cm associated with long prismatic Aegerine to 4.5cm.

7mm Serandite crystal on Sodalite replaced by Catapleiite.


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Serandite from Sirenevaya pegmatite, Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia

Serandite
            from Sirenevaya pegmatite, Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia

Light pink prismatic crystal to 2.5cm in purple Ussingite matrix.

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Serandite from Shkatulka pegmatite, Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia

Serandite
            from Shkatulka pegmatite, Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia

Reddish long bladed crystals to over 3cm in Ussingite matrix.

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Serandite from Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia

Serandite
            from Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia

Orange brown bladed crystals to 1.5cm in purple Ussingite matrix with white, platy Vuonnemite.

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Serandite from Lovozero Massif, Kola Peninsula, Russia

Serandite
            from Lovozero Massif, Kola Peninsula, Russia

Lovozero is a big area and this specimen deserves a more specific locality. But if I had to guess it would be from the Shkatulka pegmatite of the Umbozero mine. It is by Igor Pekov's study the largest Ussingite body in the world and occcupies the core of this pegmatite. It is a remarkable 12 x 3 meters in size! Serandite occured in the outer fringes of the Ussingite core at Shkatulka in crystals up to 30cm long. Igor Pekov's book on Lovozero Massif is an informative resource on the subject.

This specimen has carrot to orange brown bladed crystals to 3cm with large plates of Vuonnemite to 3cm. Minerals in this pegmatite are considered hyperalkaline (extremely alkaline).

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Serandite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Serandite
            from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Salmon pink bladed crystals to 3.5cm with white, radial Leifite and white Analcime.

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Serandite from Kola Peninsula, Russia

Serandite
            from Kola Peninsula, Russia

Pink bladed Serandite to 3cm in pink Ussingite matrix with with Mountainite. 

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Serandite from Umbozero mine, Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia

Serandite
            from Umbozero mine, Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia

Pink salmon colored Serandite elongated crystals packed tightly with Ussingite (lilac), Steenstrupine (dark brown, metamict) and Bornemanite (creamy yellow). Ex. Dr. J. Hyrsl.

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