Mineralogy Database

Bulachite Mineral Data

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General Bulachite Information

Help on Chemical  Formula: Chemical Formula: Al2(AsO4)(OH)3•3(H2O)
Help on Composition: Composition: Molecular Weight = 297.95 gm
   Aluminum  18.11 %  Al   34.22 % Al2O3
   Arsenic   25.15 %  As   38.57 % As2O5
   Hydrogen   3.04 %  H    27.21 % H2O
   Oxygen    53.70 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al2(AsO4)(OH)3•3(H2O)
Help on IMA Status: IMA Status: Approved IMA 1985
Help on Locality: Locality: Neubulach, northern Black Forest, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Bulachite + Pronunciation Say BULACHITE

Bulachite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8734:1:0.3953
Help on Cell Dimensions: Cell Dimensions: a = 15.53, b = 17.78, c = 7.03, Z = 10; V = 1,941.15 Den(Calc)= 2.55
Help on Crystal System: Crystal System: Orthorhombic Space Group: Pmnm,P 21221,Pma2,P mn21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.78(1), 3.49(0.8), 8.97(0.7),

Physical Properties of Bulachite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White, Light green.
Help on Density: Density: 2.6
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Silky
Help on Streak: Streak: white

Optical Properties of Bulachite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.072 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2136,KPDmeas= 0.2095,KC= 0.2258
Ncalc = 1.58 - 1.59
Help on Optical Data: Optical Data: Biaxial (-), a=1.54, b=1.546, g=1.548, bire=0.0080, 2V(Calc)=58, 2V(Meas)=66. Dispersion r > v.

Calculated Properties of Bulachite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.53 gm/cc
note: Specific Gravity of Bulachite =2.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002623185
Boson Index = 0.9997376815
Help on Photoelectric: Photoelectric: PEBulachite = 17.02 barns/electron
U=PEBulachite x rElectron Density= 43.10 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bulachite is Not Radioactive

Bulachite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.06)where (AB)2 (XO4) Zq � x(H2O)
  (42.06.07)Senegalite Group Senegalite Al2(PO4)(OH)3•(H2O) P na21 mm2 Bulachite Al2(AsO4)(OH)3•3(H2O) Pmnm,P 21221,Pma2,P mn21 Ortho
Help on  Strunz Class: Strunz Class: 08.DE.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DE -With only medium-sized cations, (OH, etc.):RO4 = 3:1
08.DE.15 Bulachite Al2(AsO4)(OH)3•3(H2O) Pmnm,P 21221,Pma2,P mn21 Ortho

Other Bulachite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Bulachite :
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

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Dana No: Strunz No: 08.DE.15





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