Atelestite Mineral Data

General Atelestite Information

Chemical Formula:

Bi8(AsO4)3(OH)5O5

Composition:

Molecular Weight = 2,253.63 gm

Bismuth 74.18 % Bi 82.70 % Bi₂O₃

Arsenic 9.97 % As 15.30 % As₂O₅

Hydrogen 0.22 % H 2.00 % H₂O

Oxygen 15.62 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Bi₈(AsO₄)₃(OH)₅O₅

Environment:

As a rare secondary mineral in the oxidized zone of bismuth- and arsenic-bearing mineral deposits.

IMA Status:

Valid Species (Pre-IMA) 1832

Locality:

In Germany, in Saxony, at the Neuhilfe, the Weisser Hirsch, and the Junge Kalbe mines, Neustadtel-Schneeberg; from Gadernheim, near Bensheim, Hesse; and the Neubulach and the Schmiedes Link to MinDat.org Location Data.

Name Origin:

Derivation not explicitly stated. Probably from the Greek for "incomplete," as the composition was undetermined when the mineral was first described.

Name Pronunciation:

Atelestite + Pronunciation

Synonym:

ICSD 70112

PDF 15-735

Atelestite Image

Images:

Atelestite

Comments: Double-terminated crystal of atelestite.
Location: Junge Kalbe Mine, Neustfdtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size: 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Atelestite Crystallography

Axial Ratios:

a:b:c =1.4663:1:0.9407

Cell Dimensions:

a = 10.88, b = 7.42, c = 6.98, Z = 1; beta = 107.213° V = 538.25 Den(Calc)= 6.95

Crystal System:

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

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

By Intensity(I/I_o): 3.239(1), 3.116(0.4), 2.725(0.3),

Forms:

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Forms: ( 1 1 1) ( 0 1 0) ( 1 1 0) ( 1 0 1) ( 1 0 0)

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Physical Properties of Atelestite

Cleavage:

{???} Indistinct

Color:

Green, Light yellow, Black.

Density:

6.82

Diaphaneity:

Transparent to Translucent

Hardness:

4.5-5 - Near Apatite

Luster:

Adamantine - Resinous

Streak:

white

Optical Properties of Atelestite

Gladstone-Dale:

CI meas= -0.073 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1664,KPDmeas= 0.1696,KC= 0.1581
Ncalc = 2.08 - 2.1

Optical Data:

Biaxial (+), a=2.14, b=2.15, g=2.18, bire=0.0400, 2V(Calc)=62, 2V(Meas)=44.

Calculated Properties of Atelestite

Electron Density:

Bulk Density (Electron Density)=5.82 gm/cc
note: Specific Gravity of Atelestite =6.95 gm/cc.

Fermion Index:

Fermion Index = 0.0000760467
Boson Index = 0.9999239533

Photoelectric:

PE_Atelestite=1,432.77 barns/electron
U=PE_Atelestite x rElectron Density=8,342.18 barns/cc.

Radioactivity:

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

Atelestite Classification

Dana Class:

41.11.05.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.11)with miscellaneous formulae

(41.11.05)Dana Group

41.11.05.01 Atelestite Bi8(AsO4)3(OH)5O5 P 2₁/a 2/m

Strunz Class:

08.BO.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BO -With only large cations, (OH, etc.):RO4 ï¿½ 1:1

08.BO.15 Atelestite Bi8(AsO4)3(OH)5O5 P 2₁/a 2/m

08.BO.15 Hechtsbergite! Bi2O(OH)(VO4) P 2₁/c 2/m

08.BO.15 Smrkovecite! Bi2O(OH)(PO4) P 2₁/c 2/m

Other Atelestite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Atelestite :
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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Atelestite

Bi8(AsO4)3(OH)5O5
Dana No: 41.11.05.01 Strunz No: 08.BO.15
Locality:

Notes:

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