Guanacoite Mineral Data (original) (raw)

General Guanacoite Information

Help on Chemical Formula: Chemical Formula:

(Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2

Help on Composition: Composition:

Molecular Weight = 612.83 gm

Magnesium 12.41 % Mg 20.59 % MgO

Copper 19.39 % Cu 24.27 % CuO

Arsenic 24.45 % As 37.50 % As2O5

Hydrogen 1.97 % H 17.64 % H2O

Oxygen 41.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

2(Cu0.85)2(Mg0.15)Mg2Mg0.83Cu0.17(OH)4(AsO4)2(H2O)4

Help on Environment: Environment:

Isotypic with akrochordite

Help on IMA Status: IMA Status:

Approved IMA 2003 (Dana # Added)

Help on Locality: Locality:

Mine dump at the El Guanaco Mine, East Catalina, Chile, South America Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for the locality.

Help on Synonym: Synonym:

IMA2003-021

Guanacoite Image

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

Click Here for Larger Guanacoite Image Guanacoite Comments: Deep blue, bladed, glassy crystals of guanacoite to 0.75mm lining vugs of arhbarite.. Location: El Guanaco Mine, Guanaco, Taltal, Antofagasta Province, Chile.Scale: Picture Size 5mm. © Tom Loomis / Dakota Matrix

Guanacoite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.3247:1:0.4115

Help on Cell Dimensions: Cell Dimensions:

a = 5.459, b = 16.808, c = 6.917, Z = 2; beta = 100.44° V = 624.16 Den(Calc)= 3.26

Help on Crystal System: Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 8.42(1), 4.21(0.64), 4.32(0.21),3.016(0.12), 2.907(0.1), 2.809(0.07),

Click Here for Large Guanacoite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Help on Above

| | Witzke T , Kolitsch U , Krause W , Wiechowski A , Medenbach O , Kampf A R , Steele I M , Favreau G , European Journal of Mineralogy , 18 (2006) p.813-821, Guanacoite, Cu2Mg2(Mg0.5Cu0.5)(OH)4(H2O)4(AsO4)2, a new arsenate mineral, species from the El Guanaco Mine, near Taltal, Chile: Description and crystal structure, Locality: El Guanaco Mine, Taltal, Chile | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Guanacoite

Help on Color: Color:

Blue, Pale blue.

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Habit: Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

pale blue

Optical Properties of Guanacoite

Help on Gladstone-Dale: Gladstone-Dale:

CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2096,KC= 0.2032
Ncalc = 1.66

Help on Optical Data: Optical Data:

Biaxial (-), a=1.664, b=1.691, g=1.695, bire=0.0310

Calculated Properties of Guanacoite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Guanacoite =3.26 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

PEGuanacoite = 25.03 barns/electron
U=PEGuanacoite x rElectron Density= 79.31 barns/cc.

Help on Radioactivity: Radioactivity:

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

Guanacoite Classification

Help on Dana Class: Dana Class:

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

(42.04)where (AB)5 (XO4)2 Zq � x(H2O)

(42.04.01)Akrochordite Group

42.04.01.01 Akrochordite Mn4Mg(AsO4)2(OH)4•4(H2O) P 21/c 2/m

42.04.01.02 Guanacoite! (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 P 21/c 2/m

Help on Strunz Class: Strunz Class:

08.DD.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DD -With only medium-sized cations, (OH, etc.):RO4 = 2:1

08.DD.10 Akrochordite Mn4Mg(AsO4)2(OH)4•4(H2O) P 21/c 2/m

08.DD.10 Guanacoite! (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 P 21/c 2/m

Other Guanacoite Information

Help on References: References:

NAME( AmMin, v93:501) PHYS. PROP.(AmMin, v93:501) OPTIC PROP.(AmMin, v93:501)

Help on See Also: See Also:

Links to other databases for Guanacoite :
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

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Ask about Guanacoite here :
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Print or Cut-and-Paste your Guanacoite Specimen Label here :

Guanacoite

(Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2
Dana No: 42.04.01.02 Strunz No: 08.DD.10
Locality:

Notes: