Serandite Mineral Data

Serandite Mineral Data +

General Serandite Information

Chemical Formula:

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

Composition:

Molecular Weight = 354.69 gm

Sodium 6.48 % Na 8.74 % Na₂O

Calcium 5.65 % Ca 7.91 % CaO

Manganese 23.23 % Mn 30.00 % MnO

Silicon 23.75 % Si 50.82 % SiO₂

Hydrogen 0.28 % H 2.54 % H₂O

Oxygen 40.60 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaMn²⁺_1.5Ca_0.5Si₃O₈(OH)

Environment:

Alkaline rocks and syenite pegmatites. Forms a series with pectolite.

IMA Status:

Valid Species (Pre-IMA) 1931

Locality:

Rouma, Los Islands, Guinea. Link to MinDat.org Location Data.

Name Origin:

Named for J. M. Serand, West African mineral collector.

Synonym:

ICSD 12130

PDF 25-723

Serandite Image

Images:

Serandite Analcime Natrolite

Comments: Orange-red, blocky serandite with white, blocky natrolite and white, equant grains of analcime.
Location: Mt. St. Hilaire, Canada. Scale: 4 x 3 cm.
© Fabre Minerals

Images:

Serandite Lintisite

Comments: Yellowish-white fibrous veinlets of lintisite in brown serandite.
Location: Mount Alluaiv, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Serandite Crystallography

Axial Ratios:

a:b:c =1.1071:1:0.9779

Cell Dimensions:

a = 7.638, b = 6.899, c = 6.747, Z = 2; alpha = 90.53°, beta = 94.12°, gamma = 102.75° V = 345.85 Den(Calc)= 3.41

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.983(1), 3.158(0.9), 2.838(0.65),

Forms:

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Crystal Structure:

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Takeuchi Y , Kudoh Y , Yamanaka T , American Mineralogist , 61 (1976) p.229-237, Crystal chemistry of the serandite-pectolite series and related minerals

View Additional jPOWD Structure files for Serandite
[1] [2] [3] [4]

Physical Properties of Serandite

Cleavage:

[100] Perfect, [001] Perfect

Color:

Light brown, Light pink, Orange red.

Density:

3 - 3.4, Average = 3.2

Diaphaniety:

Transparent to Translucent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4.5-5.5 - Near Apatite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Serandite

Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2018,KPDmeas= 0.215,KC= 0.2066

Optical Data:

Biaxial (+), a=1.674-1.68, b=1.677-1.682, g=1.705-1.71, bire=0.0250-0.0360, 2V(Calc)=34-36, 2V(Meas)=33.

Calculated Properties of Serandite

Electron Density:

r_electron=3.34 gm/cc
note: r_Serandite=3.41 gm/cc.

Fermion Index

Fermion Index = 0.01136
Boson Index = 0.98864

Photoelectric:

PE_Serandite= 7.60 barns/electron
U=PE_Serandite x r_electron= 25.36 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Serandite is Not Radioactive

Serandite Classification

Dana Class:

65.2.1.5 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.2)with chains P=3

(65.2.1)Wollastonite group

65.2.1.1a Wollastonite-1A CaSiO3 P1 1

65.2.1.1b Wollastonite-2M* CaSiO3 P 2₁ 2

65.2.1.1c Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

65.2.1.2 Bustamite (Mn,Ca)3Si3O9 P1 1

65.2.1.3 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

65.2.1.4 Pectolite NaCa2Si3O8(OH) P1 1

65.2.1.5 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

65.2.1.6 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

65.2.1.7 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

Strunz Class:

VIII/F.18-80 VIII - Silicates

VIII/F - Inosilicates (chain and band) Triplet chains [Si3O9]6-

VIII/F.18 - Wollastonite-2M - Foshagite series

VIII/F.18-10 Wollastonite-1A CaSiO3 P1 1

VIII/F.18-10* Wollastonite-2M* CaSiO3 P 2₁ 2

VIII/F.18-10** Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

VIII/F.18-30 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

VIII/F.18-40 Bustamite (Mn,Ca)3Si3O9 P1 1

VIII/F.18-50 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

VIII/F.18-60 Pectolite NaCa2Si3O8(OH) P1 1

VIII/F.18-70 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

VIII/F.18-80 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

VIII/F.18-90 Foshagite Ca4Si3O9(OH)2 P 2₁/m 2/m

VIII/F.18-100 Hillebrandite Ca6Si3O9(OH)6 C mc2₁ mm2

Other Serandite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8, Enc. of Minerals, 2nd ed.,1990)

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Serandite

Na(Mn++,Ca)2Si3O8(OH)
Dana No: 65.2.1.5 Strunz No: VIII/F.18-80
Locality:

Notes: