Mineralogy Database

Birchite Mineral Data

Search Webmineral :

General Birchite Information

Help on Chemical  Formula: Chemical Formula: Cd2Cu2(PO4)2(SO4)•5H2O
Help on Composition: Composition: Molecular Weight = 741.06 gm
   Calcium      0.11 %  Ca    0.15 % CaO
   Manganese    0.15 %  Mn    0.19 % MnO
   Zinc         0.88 %  Zn    1.10 % ZnO
   Cadmium     31.70 %  Cd   36.22 % CdO
   Copper      16.64 %  Cu   20.82 % CuO
   Phosphorus   8.65 %  P    19.82 % P2O5
   Hydrogen     1.36 %  H    12.16 % H2O
   Sulfur       3.81 %  S     9.51 % SO3
   Oxygen      36.70 %  O
              ______        ______ 
              100.00 %       99.97 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu1.94P2.07S0.88O12•5(H2O)Zn0.1Cd2.09Ca0.02Mn2+0.02
Help on Environment: Environment: Late-stage supergene mineral formed as part of a suite of secondary phosphate minerals under low-temperature conditions. New structure type.
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: Block 14 Opencut, Broken Hill, New South Wales, Australia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for William D. Birch, Senior Curator of Geosciences at Museum Victoria, Australia, in recognition of his contribution to Australian geological sciences.
Help on Synonym: Synonym: IMA2006-048

Birchite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: SEM image showing bladed crystals of birchite on anglesite. The crystals are flattened on (100) and show the principal forms {100}, {010}, and {101}. (AmMin, v93:912).
Location: Block 14 Opencut, Broken Hill, New South Wales, Australia. Scale: Scale Bar 50µm.
© American Mineralogist

Birchite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5018:1:0.2944
Help on Cell Dimensions: Cell Dimensions: a = 10.489, b = 20.901, c = 6.155, Z = 4; V = 1,349.36 Den(Calc)= 3.65
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.451(1)(020), 1.919(0.8)(432), 2.902(0.7)(260),3.484(0.39)(060), 4.223(0.38)(131), 2.719(0.33)(132), 2.652(0.32)(042), 5.146(0.28)(111),

Physical Properties of Birchite

Help on Color: Color: Pale blue.
Help on Density: Density: 3.61
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Birchite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1762,KPDmeas= 0.1781,KC= 0.1793
Ncalc = 1.65
Help on Optical Data: Optical Data: Biaxial (+), a=1.624, b=1.636, g=1.669, bire=0.0450

Calculated Properties of Birchite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.43 gm/cc
note: Specific Gravity of Birchite =3.61 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PEBirchite = 89.11 barns/electron
U=PEBirchite x rElectron Density= 305.26 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Birchite is Not Radioactive

Birchite Classification

Help on  Dana Class: Dana Class: (43)Compound Phosphates, etc.
  (43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)
  (43.05.12)Synadelphite Group Synadelphite (Mn,Mg,Ca,Pb)9(AsO3)(AsO4)2(OH)9•2(H2O)(?) P nma 2/m 2/m 2/m Birchite! Cd2Cu2(PO4)2(SO4)•5H2O P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.DB.70 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DB -With only medium-sized cations, (OH, etc.):RO4 < 1:1
08.DB.70 Birchite! Cd2Cu2(PO4)2(SO4)•5H2O P nma 2/m 2/m 2/m

Other Birchite Information

Help on References: References: NAME( AmMin, v93:910) PHYS. PROP.(AmMin, v93:910) OPTIC PROP.(AmMin, v93:910)
Help on See Also: See Also: Links to other databases for Birchite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Birchite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Birchite :

Ask about Birchite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa´┐Żol

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


Dana No: Strunz No: 08.DB.70





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.