Anorthite Mineral Data (original) (raw)

General Anorthite Information

Help on Chemical Formula: Chemical Formula:

CaAl2Si2O8

Help on Composition: Composition:

Molecular Weight = 277.41 gm

Sodium 0.41 % Na 0.56 % Na2O

Calcium 13.72 % Ca 19.20 % CaO

Aluminum 18.97 % Al 35.84 % Al2O3

Silicon 20.75 % Si 44.40 % SiO2

Oxygen 46.14 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Na0.05Ca0.95Al1.95Si2.05O8

Help on Environment: Environment:

Magmatic and metamorphic rocks.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1823

Help on Locality: Locality:

Monte Somma and Valle di Fassa, Italy. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

From the Greek, an + orthos, "not upright" in allusion to the oblique crystals.

Help on Name Pronunciation: Name Pronunciation:

Anorthite + Pronunciation Say ANORTHITE

Help on Synonym: Synonym:

Ab0

An100

ICSD 654

Indianite

PDF 41-1486

Anorthite Image

Click Here for Larger Anorthite Image in a New Browser Window Images:

Anorthite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.635:1:1.1003

Help on Cell Dimensions: Cell Dimensions:

a = 8.177, b = 12.877, c = 14.169, Z = 8; alpha = 93.166°, beta = 115.85°, gamma = 91.216° V = 1,340.29 Den(Calc)= 2.75

Help on Crystal System: Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1,I1

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 3.2(1), 3.18(0.75), 4.04(0.6),

Help on Forms: Forms:

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| | Forms:( 0 0 1) ( 1 0 0) ( 1 0 1) ( 0 1 0) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Click Here for Large Anorthite Structure Window Crystal Structure:

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| | Foit F F , Peacor D R , American Mineralogist , 58 (1973) p.665-675, The anorthite crystal structure at 410 and 830 C, T = 410 C View Additional jPOWD Structure files for Anorthite [1] [2] [3] [4] [5] [6] [7] [8] [9] | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Anorthite

Help on Cleavage: Cleavage:

{001} Perfect, {010} Good

Help on Color: Color:

Colorless, Gray, White, Red, Reddish gray.

Help on Density: Density:

2.72 - 2.75, Average = 2.73

Help on Diaphaneity: Diaphaneity:

Transparent to Subtransparent to translucent

Help on Fracture: Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Help on Habit: Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Help on Habit: Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Help on Habit: Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Help on Hardness: Hardness:

6 - Orthoclase

Help on Luminescence: Luminescence:

Non-fluorescent.

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

white

Optical Properties of Anorthite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= -0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.211,KPDmeas= 0.2121,KC= 0.2079
Ncalc = 1.57

Help on Optical Data: Optical Data:

Biaxial (-), a=1.572-1.576, b=1.5785-1.5832, g=1.583-1.588, bire=0.0110-0.0120, 2V(Calc)=78, 2V(Meas)=78. Dispersion relatively weak.

Help on Pleochroism (x): Pleochroism (x):

colorless.

Help on Pleochroism (y): Pleochroism (y):

colorless.

Calculated Properties of Anorthite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Anorthite =2.75 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

PEAnorthite = 3.05 barns/electron
U=PEAnorthite x rElectron Density= 8.32 barns/cc.

Help on Radioactivity: Radioactivity:

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

Anorthite Classification

Help on Dana Class: Dana Class:

76.01.03.06 (76)Tectosilicate Al-Si Framework

(76.01)with Al-Si frameworks

(76.01.03)Plagioclase series

76.01.03.00 Plagioclase* (Na,Ca)(Si,Al)4O8 C1 1

76.01.03.01 Albite NaAlSi3O8 C1 1

76.01.03.02 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1

76.01.03.03 Andesine* (Na,Ca)(Si,Al)4O8 C1 1

76.01.03.04 Labradorite* (Ca,Na)(Si,Al)4O8 C1 1

76.01.03.05 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1

76.01.03.06 Anorthite CaAl2Si2O8 P1,I1 1

Help on Strunz Class: Strunz Class:

09.FA.35 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

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

09.FA.35 Albite NaAlSi3O8 C1 1

09.FA.35 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1

09.FA.35 Anorthite CaAl2Si2O8 P1,I1 1

09.FA.35 Andesine* (Na,Ca)(Si,Al)4O8 C1 1

09.FA.35 Labradorite* (Ca,Na)(Si,Al)4O8 C1 1

09.FA.35 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1

09.FA.35 Reedmergnerite NaBSi3O8 C1 1

09.FA.35 Plagioclase* (Na,Ca)(Si,Al)4O8 C1 1

Other Anorthite Information

Help on See Also: See Also:

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

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

Anorthite

CaAl2Si2O8
Dana No: 76.01.03.06 Strunz No: 09.FA.35
Locality:

Notes: