Scapolite Mineral Data

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General Scapolite Information

Chemical Formula:

(Na,Ca)4[Al3Si9O24]Cl

Composition:

Molecular Weight = 877.08 gm

Sodium 5.24 % Na 7.07 % Na₂O

Calcium 9.14 % Ca 12.79 % CaO

Aluminum 15.38 % Al 29.06 % Al₂O₃

Silicon 22.42 % Si 47.95 % SiO₂

Chlorine 4.04 % Cl 4.04 % Cl

- % Cl -0.91 % -O=Cl₂

Oxygen 43.78 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca₂Al₅Si₇O₂₄Cl

IMA Status:

Not Approved IMA

Locality:

Otter Lake, Canada. Link to MinDat.org Location Data.

Name Origin:

Named in 1800 rom the Greek skapos - "rod" and lithos - "stone."

Name Pronunciation:

Scapolite + Pronunciation

Synonym:

Wernerite

Scapolite Image

Images:

Scapolite

Comments: Violet colored, gemmy crystal of Scapolite, with upper terminations.
Location: Dodoma, Tanzania. Scale: 1 x 0.5 cm.
© Fabre Minerals

Scapolite Crystallography

Axial Ratios:

a:c = 1:0.62904

Cell Dimensions:

a = 12.05, c = 7.58, Z = 2; V = 1,100.64 Den(Calc)= 2.65

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: P 4₁/n

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

By Intensity(I/I_o): 3.46(1), 3.07(0.7), 3.03(0.6),3.82(0.6), 1.912(0.3), 2.69(0.3), 2.7(0.3), 6.04(0.2),

Forms:

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Forms: ( 1 0 0) ( 3 1 1) ( 1 1 1) ( 1 1 0)

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Crystal Structure:

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Levien L , Papike J J , American Mineralogist , 61 (1976) p.864-877, Scapolite crystal chemistry: Aluminum-silicon distributions, carbonate group, disorder, and thermal expansion, before heating

View Additional jPOWD Structure files for Scapolite
[1] [2] [3] [4] [5] [6] [7] [8]

Physical Properties of Scapolite

Cleavage:

{100} Distinct, {110} Distinct

Color:

White, Gray, Pale brown, Pink, Yellow.

Density:

2.56 - 2.77, Average = 2.66

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

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

Hardness:

6 - Orthoclase

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Scapolite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2108,KPDmeas= 0.2096,KC= 0.213
Ncalc = 1.55 - 1.59

Optical Data:

Uniaxial (-), e=1.522-1.571, w=1.534-1.607, bire=0.0120-0.0360.

Calculated Properties of Scapolite

Electron Density:

Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Scapolite =2.65 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Scapolite= 2.78 barns/electron
U=PE_Scapolite x rElectron Density= 7.30 barns/cc.

Radioactivity:

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

Scapolite Classification

Dana Class:

76.03.01.00 (76)Tectosilicate Al-Si Framework

(76.03)with other Be/Al/Si frameworks

(76.03.01)Scapolite group

76.03.01.00 Scapolite* (Na,Ca)4[Al3Si9O24]Cl P 4₁/n 4/m

76.03.01.01 Marialite Na4Al3Si9O24Cl I 4/m 4/m

76.03.01.02 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m

76.03.01.03 Silvialite! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m

Strunz Class:

09.FB.15 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FB -Tektosilicates with additional anions

09.FB.15 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m

09.FB.15 Marialite Na4Al3Si9O24Cl I 4/m 4/m

09.FB.15 Scapolite* (Na,Ca)4[(Al,Si)12O24]Cl P 4₁/n 4/m

09.FB.15 Silvialite! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m

Other Scapolite Information

References:

NAME( Mason68) PHYS. PROP.(Mason68) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Scapolite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - CalTech Mineral Spectroscopy
5 - Franklin Minerals(Palache)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - HyperPhysics
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Scandinavian mineral gallery
16 - Tradeshop.com - The Rainbow of Gems
17 - UCLA - Petrography Thin-Sections
18 - WWW-MINCRYST

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

Scapolite

(Na,Ca)4[Al3Si9O24]Cl
Dana No: 76.03.01.00 Strunz No: 09.FB.15
Locality:

Notes: