Slawsonite Mineral Data (original) (raw)

General Slawsonite Information

Help on Chemical Formula: Chemical Formula:

(Sr,Ca)Al2Si2O8

Help on Composition: Composition:

Molecular Weight = 309.65 gm

Strontium 22.64 % Sr 26.77 % SrO

Calcium 1.29 % Ca 1.81 % CaO

Aluminum 15.68 % Al 29.64 % Al2O3

Silicon 19.05 % Si 40.75 % SiO2

Oxygen 41.34 % O

______ ______

100.00 % 98.97 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Sr0.8Ca0.1Al1.8Si2.1O8

Help on Environment: Environment:

In pectolite veinlets in metamorphosed xenoliths.

Help on IMA Status: IMA Status:

Approved IMA 1977

Help on Locality: Locality:

From the Wallowa Mountains, Wallowa County, Oregon, USA. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Chester Baker Slawson (1898-1964, Mineralogist AT THE University of Michigan, Ann Arbor, Michigan, USA.

Help on Name Pronunciation: Name Pronunciation:

Slawsonite + Pronunciation Say SLAWSONITE

Help on Synonym: Synonym:

ICSD 100141

PDF 37-462

Slawsonite Image

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Slawsonite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.9511:1:0.891

Help on Cell Dimensions: Cell Dimensions:

a = 8.888, b = 9.344, c = 8.326, Z = 4; beta = 90.33° V = 691.46 Den(Calc)= 2.97

Help on Crystal System: Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/a

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 3.708(1), 2.917(0.7), 3.498(0.64),

Click Here for Large Slawsonite Structure Window Crystal Structure:

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| | Griffen D T , Ribbe P H , Gibbs G V , American Mineralogist , 62 (1977) p.31-35, The structure of slawsonite, a strontium analog of paracelsian | | -------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Slawsonite

Help on Cleavage: Cleavage:

{001} Good, {010} Fair

Help on Color: Color:

Colorless, Medium gray.

Help on Density: Density:

3.05 - 3.5, Average = 3.27

Help on Diaphaneity: Diaphaneity:

Semitransparent

Help on Habit: Habit:

Aggregates - Made of numerous individual crystals or clusters.

Help on Habit: Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Help on Habit: Habit:

Tabular - Form dimensions are thin in one direction.

Help on Hardness: Hardness:

5.5-6.5 - Knife Blade-Pyrite

Help on Luminescence: Luminescence:

Fluorescent, Short UV=pinkish red purple.

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

white

Optical Properties of Slawsonite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= 0.062 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1951,KPDmeas= 0.1769,KC= 0.1887
Ncalc = 1.56 - 1.66

Help on Optical Data: Optical Data:

Biaxial (-), a=1.57-1.573, b=1.581-1.582, g=1.585-1.586, bire=0.0130-0.0150, 2V(Calc)=60-66, 2V(Meas)=55-82. Dispersion r < v medium.

Calculated Properties of Slawsonite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.86 gm/cc
note: Specific Gravity of Slawsonite =2.97 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Help on Photoelectric: Photoelectric:

PESlawsonite = 26.20 barns/electron
U=PESlawsonite x rElectron Density= 74.99 barns/cc.

Help on Radioactivity: Radioactivity:

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

Slawsonite Classification

Help on Dana Class: Dana Class:

76.01.05.02 (76)Tectosilicate Al-Si Framework

(76.01)with Al-Si frameworks

(76.01.05)Paracelsian group

76.01.05.01 Paracelsian BaAl2Si2O8 P 21/c 2/m

76.01.05.02 Slawsonite (Sr,Ca)Al2Si2O8 P 21/a 2/m

Help on Strunz Class: Strunz Class:

09.FA.50 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1

09.FA.50 Slawsonite (Sr,Ca)Al2Si2O8 P 21/a 2/m

Other Slawsonite Information

Help on References: References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

Help on See Also: See Also:

Links to other databases for Slawsonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Slawsonite here :
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Print or Cut-and-Paste your Slawsonite Specimen Label here :

Slawsonite

(Sr,Ca)Al2Si2O8
Dana No: 76.01.05.02 Strunz No: 09.FA.50
Locality:

Notes: