Aphthitalite Mineral Data (original) (raw)

General Aphthitalite Information

Help on Chemical Formula: Chemical Formula:

(K,Na)3Na(SO4)2

Help on Composition: Composition:

Molecular Weight = 320.33 gm

Potassium 27.46 % K 33.08 % K2O

Sodium 12.56 % Na 16.93 % Na2O

Sulfur 20.02 % S 49.99 % SO3

Oxygen 39.96 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

K2.25Na1.75(SO4)2

Help on Environment: Environment:

1. Incrustations in fumaroles of volcanos. 2. Small crystals in marine and continental evaporite deposits.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1813

Help on Locality: Locality:

Douglashall near Strassfurt, Germany. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named from the Greek for "unalterable" and "salt" in allusion to its stability in air.

Help on Name Pronunciation: Name Pronunciation:

Aphthitalite + Pronunciation Say APHTHITALITE

Help on Synonym: Synonym:

Aphthalose

Glaserite

ICSD 26014

PDF 20-928

Vesuvian Salt

Aphthitalite Image

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Aphthitalite Crystallography

Help on Axial Ratios: Axial Ratios:

a:c = 1:1.29026

Help on Cell Dimensions: Cell Dimensions:

a = 5.65, c = 7.29, Z = 1; V = 201.54 Den(Calc)= 2.64

Help on Crystal System: Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.85(1), 2.09(0.9), 2.97(0.9),

Help on Forms: Forms:

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| | Forms:( 0 1 2) ( 1 0 0) ( 0 0 1) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | --------------------------------------------------------------------------------------------------------------------------------------------------- |

Click Here for Large Aphthitalite Structure Window Crystal Structure:

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| | Okada K , Ossaka J , Acta Crystallographica, Section B , 36 (1980) p.919-921, Structures of potassium sodium sulphate and tripotassium sodium disulphate | | ----------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Aphthitalite

Help on Cleavage: Cleavage:

{1011} Good

Help on Color: Color:

Blue, Colorless, Green, Gray, Gray blue.

Help on Density: Density:

2.7

Help on Diaphaneity: Diaphaneity:

Transparent to Opaque

Help on Fracture: Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Help on Habit: Habit:

Encrustations - Forms crust-like aggregates on matrix.

Help on Habit: Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Help on Hardness: Hardness:

3 - Calcite

Help on Luminescence: Luminescence:

Fluorescent, Short UV=weak yellow, Long UV=butter yellow.

Help on Luster: Luster:

Vitreous - Resinous

Help on Magnetism: Magnetism:

Nonmagnetic

Help on Streak: Streak:

white

Optical Properties of Aphthitalite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1865,KPDmeas= 0.1823,KC= 0.1855
Ncalc = 1.49 - 1.5

Help on Optical Data: Optical Data:

Uniaxial (+), w=1.487-1.491, e=1.492-1.499, bire=0.0050-0.0080.

Calculated Properties of Aphthitalite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.60 gm/cc
note: Specific Gravity of Aphthitalite =2.64 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.001726293
Boson Index = 0.998273707

Help on Photoelectric: Photoelectric:

PEAphthitalite = 4.16 barns/electron
U=PEAphthitalite x relectron= 10.84 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 390.88 (Gamma Ray American Petroleum Institute Units)
Concentration of Aphthitalite per GRapi unit = 0.26 (%)

Estimated Radioactivity from Aphthitalite - barely detectable

Aphthitalite Classification

Help on Dana Class: Dana Class:

28.02.02.01 (28)Anhydrous Acid and Sulfates

(28.02)(A+)2 XO4

(28.02.02)Dana Group

28.02.02.01 Aphthitalite (K,Na)3Na(SO4)2 P 3m 3 2/m

Help on Strunz Class: Strunz Class:

07.AC.35 07 - SULFATES (SELENATES, TELLURATES)

07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O

07.AC -With medium-sized and large cations

07.AC.35 Aphthitalite (K,Na)3Na(SO4)2 P 3m 3 2/m

Other Aphthitalite Information

Help on References: References:

NAME( Dana7) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

Help on See Also: See Also:

Links to other databases for Aphthitalite :
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 Aphthitalite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Aphthitalite Specimen Label here :

Aphthitalite

(K,Na)3Na(SO4)2
Dana No: 28.02.02.01 Strunz No: 07.AC.35
Locality:

Notes: