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.

Name Pronunciation:

Serandite + Pronunciation

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:

Lintisite Serandite

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 - Pinacoidal H-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),

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Forms: ( 0 1 0) ( 1 1 0) ( 1 0 1) ( 1 0 0) ( 0 0 1)

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Physical Properties of Serandite

Cleavage:

{100} Perfect, {001} Perfect

Color:

Light brown, Light pink, Orange red.

Density:

3 - 3.4, Average = 3.2

Diaphaneity:

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
Ncalc = 1.62 - 1.7

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:

Bulk Density (Electron Density)=3.34 gm/cc
note: Specific Gravity of Serandite =3.41 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Serandite= 7.60 barns/electron
U=PE_Serandite x rElectron Density= 25.36 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Serandite is Not Radioactive

Serandite Classification

Dana Class:

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

(65.02)with chains P=3

(65.02.01)Wollastonite group

65.02.01.01a Wollastonite-1A CaSiO3 P1 1

65.02.01.01b Wollastonite-2M* CaSiO3 P 2₁ 2

65.02.01.01c Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

65.02.01.02 Bustamite (Mn,Ca)3Si3O9 P1 1

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

65.02.01.04 Pectolite NaCa2Si3O8(OH) P1 1

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

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

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

65.02.01.08 Tanohataite! LiMn2Si3O8(OH) P1 1

Strunz Class:

09.DG.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DG -Inosilicates with 3-periodic single and multiple chains

09.DG.05 Bustamite (Mn,Ca)3Si3O9 P1 1

09.DG.05 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

09.DG.05 Pectolite NaCa2Si3O8(OH) P1 1

09.DG.05 Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

09.DG.05 Wollastonite-1A CaSiO3 P1 1

09.DG.05 Wollastonite-2M* CaSiO3 P 2₁ 2

09.DG.05 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

Other Serandite Information

References:

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

See Also:

Links to other databases for Serandite :
1 - Alkali-Nuts(Francais)
2 - Am. Min. Crystal Structure Database
3 - Amethyst Galleries' Mineral Gallery
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineral and Gemstone Kingdom
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - WWW-MINCRYST

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Print or Cut-and-Paste your Serandite Specimen Label here :

Serandite

Na(Mn++,Ca)2Si3O8(OH)
Dana No: 65.02.01.05 Strunz No: 09.DG.05
Locality:

Notes:

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