Armstrongite Mineral Data (original) (raw)

General Armstrongite Information

Help on Chemical Formula: Chemical Formula:

CaZrSi6O15•3(H2O)

Help on Composition: Composition:

Molecular Weight = 593.85 gm

Calcium 6.75 % Ca 9.44 % CaO

Zirconium 15.36 % Zr 20.75 % ZrO2

Silicon 28.38 % Si 60.71 % SiO2

Hydrogen 1.02 % H 9.10 % H2O

Oxygen 48.50 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

CaZrSi6O15•3(H2O)

Help on Environment: Environment:

Not a lunar mineral. Associated with alkalic rocks.

Help on IMA Status: IMA Status:

Approved IMA 1973

Help on Locality: Locality:

TL:Khan-Bogdin massif, Mongolia. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Neil Alden Armstrong, (1930-), American astronaut, first human being on the moon's surface, Apollo 11 Lunar Mission.

Help on Name Pronunciation: Name Pronunciation:

Armstrongite + Pronunciation Say ARMSTRONGITE

Help on Synonym: Synonym:

ICSD 27752

PDF 29-395

Armstrongite Image

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Armstrongite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.9982:1:0.5547

Help on Cell Dimensions: Cell Dimensions:

a = 14.108, b = 14.133, c = 7.84, Z = 4; beta = 109.4° V = 1,474.45 Den(Calc)= 2.68

Help on Crystal System: Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: C 2

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 3.05(1), 4.26(1), 6.6(0.9),

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| | Kashaev A A , Sapozhnikov A N , Kristallografiya , 23 (1978) p.956-961, Crystal structure of armstrongite | | ------------------------------------------------------------------------------------------------------------ |

Physical Properties of Armstrongite

Help on Cleavage: Cleavage:

{001} Perfect, {100} Distinct

Help on Color: Color:

Light brown, Reddish brown.

Help on Density: Density:

2.7 - 2.71, Average = 2.7

Help on Diaphaneity: Diaphaneity:

Translucent

Help on Fracture: Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Help on Habit: Habit:

Aggregates - Made of numerous individual crystals or clusters.

Help on Habit: Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Help on Habit: Habit:

Spherical - Spherical, rounded aggregates.

Help on Hardness: Hardness:

4.5 - Between Fluorite and Apatite

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

brownish white

Optical Properties of Armstrongite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= 0.049 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2121,KPDmeas= 0.2101,KC= 0.2208
Ncalc = 1.59 - 1.6

Help on Optical Data: Optical Data:

Biaxial (-), a=1.563, b=1.569, g=1.573, bire=0.0100

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

colorless.

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

colorless.

Help on Pleochroism (z): Pleochroism (z):

colorless.

Calculated Properties of Armstrongite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.65 gm/cc
note: Specific Gravity of Armstrongite =2.68 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Help on Photoelectric: Photoelectric:

PEArmstrongite = 21.90 barns/electron
U=PEArmstrongite x rElectron Density= 58.12 barns/cc.

Help on Radioactivity: Radioactivity:

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

Armstrongite Classification

Help on Dana Class: Dana Class:

72.05.04.01 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.05)with corrugated and complex layers

(72.05.04)Elpidite/armstrongite

72.05.04.01 Armstrongite CaZrSi6O15•3(H2O) C 2 2

72.05.04.02 Elpidite Na2ZrSi6O15•3(H2O) Pb21m mm2

Help on Strunz Class: Strunz Class:

09.EA.35 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

09.EA.35 Armstrongite CaZrSi6O15•3(H2O) C 2 2

Other Armstrongite Information

Help on References: References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin Vol 86, p 1537) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

Help on See Also: See Also:

Links to other databases for Armstrongite :
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 Armstrongite here :
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Print or Cut-and-Paste your Armstrongite Specimen Label here :

Armstrongite

CaZrSi6O15•3(H2O)
Dana No: 72.05.04.01 Strunz No: 09.EA.35
Locality:

Notes: