Calcioandyrobertsite-2O Mineral Data

[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts]
See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM]
Mineral News was founded some twenty years ago and has developed a following of
avid mineral collectors seeking timely information about new finds and other items
of interest to the collector community. Articles are solicited from collector and scientific authors.

General Calcioandyrobertsite-2O Information

Chemical Formula:

KCaCu5(AsO4)4[As(OH)2O2]•2(H2O)

Composition:

Molecular Weight = 1,129.55 gm

Potassium 3.46 % K 4.17 % K₂O

Calcium 3.55 % Ca 4.96 % CaO

Copper 28.13 % Cu 31.67 % Cu₂O

Arsenic 33.16 % As 50.87 % As₂O₅

Hydrogen 0.54 % H 4.78 % H₂O

Oxygen 31.16 % O

______ ______

100.00 % 96.46 % = TOTAL OXIDE

Empirical Formula:

KCaCu₅(AsO₄)₄(OH)₂AsO₂•2(H₂O)

Environment:

Occurs in a specimen of quartz gangue. Polymorph of calcioandyrobertsite; structure.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Tsumeb mine, Namibia Link to MinDat.org Location Data.

Name Origin:

Named as the -2O polytype of calcio-andyrobertsite-1M

Name Pronunciation:

Calcioandyrobertsite-2O + Pronunciation

Synonym:

Calcio-andyrobertsite-2O - Renamed Calcioandyrobertsite-2O by Mineralogical Record, v39 (2008), p131

IMA2000-011

Search for Calcioandyrobertsite-2O Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Calcioandyrobertsite-2O Crystallography

Axial Ratios:

a:b:c =1.9477:1:0.9877

Cell Dimensions:

a = 19.647, b = 10.087, c = 9.963, Z = 4; V = 1,974.46 Den(Calc)= 3.80

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 3.116(1)(322,610), 2.76(0.9)(132), 4.487(0.9)(220),4.83(0.7)(102), 7.084(0.7)(011), 3.965(0.6)(302), 6.665(0.6)(111), 9.8(0.5)(200), 1.758(0.4)(840,11.0.1),

Physical Properties of Calcioandyrobertsite-2O

Cleavage:

{100} Good

Color:

Intense blue.

Density:

3.9

Diaphaneity:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

pale blue

Optical Properties of Calcioandyrobertsite-2O

Gladstone-Dale:

CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1912,KPDmeas= 0.1863,KC= 0.1914
Ncalc = 1.73 - 1.75

Optical Data:

Biaxial (-), a=1.715, b=1.73, g=1.735, bire=0.0200

Calculated Properties of Calcioandyrobertsite-2O

Electron Density:

Bulk Density (Electron Density)=3.57 gm/cc
note: Specific Gravity of Calcioandyrobertsite-2O =3.80 gm/cc.

Fermion Index:

Fermion Index = 0.000202433
Boson Index = 0.999797567

Photoelectric:

PE_{Calcioandyrobertsite-2O}= 36.27 barns/electron
U=PE_{Calcioandyrobertsite-2O} x r_electron= 129.57 barns/cc.

Radioactivity:

GRapi = 46.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Calcioandyrobertsite-2O per GRapi unit = 2.13 (%)

Estimated Radioactivity from Calcioandyrobertsite-2O - barely detectable

Calcioandyrobertsite-2O Classification

Dana Class:

42.09.02.05 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.09)where (A)3 (XO4)2 Zq · x(H2O)

(42.09.02)Souzalite Group

42.09.02.01 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6•2(H2O) P1,P 1 Tri

42.09.02.02 Gormanite Fe3Al4(PO4)4(OH)6•2(H2O) P1,P 1 Tri

42.09.02.03 Andyrobertsite! KCdCu5(AsO4)4[As(OH)2O2]•2(H2O) P 2₁/m 2/m

42.09.02.04 Calcioandyrobertsite-1M! KCaCu5(AsO4)4[As(OH)2O2]•2(H2O) P 2₁/m 2/m

42.09.02.05 Calcioandyrobertsite-2O! KCaCu5(AsO4)4[As(OH)2O2]•2(H2O) P nma 2/m 2/m 2/m

Strunz Class:

08.DH.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1

08.DH.50 Andyrobertsite! KCdCu5(AsO4)4[As(OH)2O2]•2(H2O) P 2₁/m 2/m

08.DH.50 Calcioandyrobertsite-1M! KCaCu5(AsO4)4[As(OH)2O2]•2(H2O) P 2₁/m 2/m

08.DH.50 Calcioandyrobertsite-2O! KCaCu5(AsO4)4[As(OH)2O2]•2(H2O) P nma 2/m 2/m 2/m

Other Calcioandyrobertsite-2O Information

References:

NAME( EurJMin, 16:163) PHYS. PROP.(EurJMin, 16:163) OPTIC PROP.(EurJMin, 16:163)

See Also:

Links to other databases for Calcioandyrobertsite-2O :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Calcioandyrobertsite-2O using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Calcioandyrobertsite-2O :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Diamond Dan Publications

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Calcioandyrobertsite-2O Mineral Data :

Ask about Calcioandyrobertsite-2O 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 Español

Print or Cut-and-Paste your Calcioandyrobertsite-2O Specimen Label here :

Calcioandyrobertsite-2O

KCaCu5(AsO4)4[As(OH)2O2]•2(H2O)
Dana No: 42.09.02.05 Strunz No: 08.DH.50
Locality:

Notes: