Felsobanyaite Mineral Data

General Felsobanyaite Information

Chemical Formula:

Al4(SO4)(OH)10•5(H2O)

Composition:

Molecular Weight = 464.14 gm

Aluminum 23.25 % Al 43.94 % Al₂O₃

Hydrogen 4.34 % H 38.81 % H₂O

Sulfur 6.91 % S 17.25 % SO₃

Oxygen 65.50 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al₄(SO₄)(OH)₁₀•5(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1853

Locality:

Baia Sprie, Maramures, Romania (formerly known as Felsobanya, in Hungary). Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Felsobanyaite + Pronunciation

Felsobanyaite Image

Images:

Felsobanyaite

Comments: Gray white crystalline micro grains of felsÃ¶banyaite on brown to yellow opal.
Location: Cavnik, Felsobanya, Maramures, Romania. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Felsobanyaite Crystallography

Axial Ratios:

a:c = 1:0.84376

Cell Dimensions:

a = 22.556, c = 19.032, Z = 24; V = 8,385.70 Den(Calc)= 2.21

Crystal System:

Hexagonal Space Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.64(1), 4.79(1), 2.27(0.5),

Physical Properties of Felsobanyaite

Cleavage:

{001} Perfect, {100} Distinct, {010} Distinct

Color:

Colorless, Yellow, White.

Density:

2.35

Diaphaneity:

Transparent to Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).

Habit:

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

Hardness:

1.5 - Between Talc and Gypsum

Luster:

Vitreous - Pearly

Optical Properties of Felsobanyaite

Gladstone-Dale:

CI meas= 0.119 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2373,KPDmeas= 0.2232,KC= 0.2534
Ncalc = 1.56 - 1.6

Optical Data:

Uniaxial (+), w=1.516, e=1.533, bire=0.0170.

Calculated Properties of Felsobanyaite

Electron Density:

Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Felsobanyaite =2.21 gm/cc.

Fermion Index:

Fermion Index = 0.0008390436
Boson Index = 0.9991609564

Photoelectric:

PE_{Felsobanyaite}= 1.20 barns/electron
U=PE_{Felsobanyaite} x rElectron Density= 2.74 barns/cc.

Radioactivity:

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

Felsobanyaite Classification

Dana Class:

31.04.04.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.04)where (A+ B++)4 (XO4) Zqï¿½x(H2O)

(31.04.04)Dana Group

31.04.04.01 Felsobanyaite Al4(SO4)(OH)10•5(H2O) Unk Hex

Strunz Class:

07.DD.05 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DD -With only medium-sized cations; sheets of edge-sharing octahedra

07.DD.05 Basaluminite? Al4(SO4)(OH)10•5(H2O) P 2₁ 2

07.DD.05 Felsobanyaite Al4(SO4)(OH)10•5(H2O) Unk Hex

Other Felsobanyaite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Felsobanyaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - The Felsõbányaite¹ Page

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Print or Cut-and-Paste your Felsobanyaite Specimen Label here :

Felsobanyaite

Al4(SO4)(OH)10•5(H2O)
Dana No: 31.04.04.01 Strunz No: 07.DD.05
Locality:

Notes:

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