Scapolite Mineral Data
General Scapolite Information
Chemical Formula:
(Na,Ca)4[Al3Si9O24]Cl
Composition:
Molecular Weight = 877.08 gm
Sodium 5.24 % Na 7.07 % Na2 O
Calcium 9.14 % Ca 12.79 % CaO
Aluminum 15.38 % Al 29.06 % Al2 O3
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:
Na2 Ca2 Al5 Si7 O24 Cl
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 - Dipyramidal H-M Symbol (4/m) Space Group: P 41 /n
X Ray Diffraction:
By Intensity(I/Io ): 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)
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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:
PEScapolite = 2.78 barns/electronU=PEScapolite x r Electron 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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Scapolite
(Na,Ca)4[Al3Si9O24]Cl
Dana No: 76.03.01.00 Strunz No: 09.FB.15
Locality:
Notes:
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