Scapolite Mineral Data

Scapolite Mineral Data +

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General Scapolite Information

Chemical Formula:

(Na,Ca)4[Al3Si9O24]Cl

Composition:

Molecular Weight = 879.29 gm

Sodium 5.23 % Na 7.05 % Na₂O

Calcium 9.12 % Ca 12.76 % CaO

Aluminum 9.21 % Al 17.39 % Al₂O₃

Silicon 28.75 % Si 61.50 % SiO₂

Chlorine 4.03 % Cl 4.03 % Cl

- % Cl -0.91 % -O=Cl₂

Oxygen 43.67 % O

______ ______

100.00 % 101.82 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca₂Al₃Si₉O₂₄Cl

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."

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= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2108,KPDmeas= 0.2096,KC= 0.2168

Optical Data:

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

Calculated Properties of Scapolite

Electron Density:

r_electron=2.63 gm/cc
note: r_Scapolite=2.65 gm/cc.

Fermion Index

Fermion Index = 0.01375
Boson Index = 0.98625

Photoelectric:

PE_Scapolite= 2.83 barns/electron
U=PE_Scapolite x r_electron= 7.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Scapolite is Not Radioactive

Scapolite Classification

Dana Class:

76.3.1.0 (76)Tectosilicate Al-Si Framework

(76.3)with other Be/Al/Si frameworks

(76.3.1)Scapolite group

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

76.3.1.1 Marialite Na4Al3Si9O24Cl I 4/m 4/m

76.3.1.2 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m

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

Strunz Class:

VIII/J.13-00 VIII - Silicates

VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders

VIII/J.13 - Sodalite group, Marialite - Kalborsite series

Other Scapolite Information

References:

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

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Scapolite

(Na,Ca)4[Al3Si9O24]Cl
Dana No: 76.3.1.0 Strunz No: VIII/J.13-00
Locality:

Notes: