Guildite Mineral Data

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General Guildite Information

Chemical Formula:

CuFe+++(SO4)2(OH)•4(H2O)

Composition:

Molecular Weight = 400.59 gm

Iron 13.94 % Fe 19.93 % Fe₂O₃

Copper 15.86 % Cu 17.86 % Cu₂O

Hydrogen 2.26 % H 20.24 % H₂O

Sulfur 16.01 % S 39.97 % SO₃

Oxygen 51.92 % O

______ ______

100.00 % 98.00 % = TOTAL OXIDE

Empirical Formula:

CuFe³⁺(SO₄)₂(OH)•4(H₂O)

Environment:

Secondary mineral formed in mine workings by burning pyritic ores.

IMA Status:

Valid Species (Pre-IMA) 1928

Locality:

United Verde mine, Jerome, Yavapai Co., Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Frank Nelson Guild (1870-1939), American mineralogist and economic geologist, University of Arizona, Tucson, Arizona, USA.

Name Pronunciation:

Guildite

Synonym:

ICSD 100630

PDF 23-217

Guildite Image

Images:

Guildite Magnesiocopiapite

Comments: Brown granular guildite with greenish yellow magnesiocopiapite.
Location: United Verde Mine, Jerome, Yavapai County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Guildite Crystallography

Axial Ratios:

a:b:c =1.3717:1:1.018

Cell Dimensions:

a = 9.786, b = 7.134, c = 7.263, Z = 2; beta = 105.28° V = 489.13 Den(Calc)= 2.72

Crystal System:

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

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

By Intensity(I/I_o): 3.144(1), 9.46(0.35), 4.998(0.27),

Physical Properties of Guildite

Cleavage:

{???} Perfect

Color:

Brown, Honey yellow, Dark brown.

Density:

2.73

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Guildite

Gladstone-Dale:

CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.237,KPDmeas= 0.2361,KC= 0.2441
Ncalc = 1.66 - 1.67

Optical Data:

Biaxial (+), a=1.622-1.623, b=1.628-1.63, g=1.681-1.684, bire=0.0590-0.0610

Calculated Properties of Guildite

Electron Density:

Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Guildite =2.72 gm/cc.

Fermion Index:

Fermion Index = 0.0044088701
Boson Index = 0.9955911299

Photoelectric:

PE_Guildite= 11.80 barns/electron
U=PE_Guildite x rElectron Density= 32.04 barns/cc.

Radioactivity:

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

Guildite Classification

Dana Class:

31.09.07.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.09)where (A+ B++) (XO4) Zq·x(H2O)

(31.09.07)Dana Group

31.09.07.01 Guildite CuFe(SO4)2(OH)•4(H2O) P 2₁/m 2/m

31.09.07.02 Chaidamuite (Zn,Fe)Fe(SO4)2(OH)•4(H2O) P1 1

Strunz Class:

07.DC.30 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DC -With only medium-sized cations; chains of corner-sharing octahedra

07.DC.30 Chaidamuite (Zn,Fe)Fe(SO4)2(OH)•4(H2O) P1 1

07.DC.30 Guildite CuFe(SO4)2(OH)•4(H2O) P 2₁/m 2/m

Other Guildite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Guildite :
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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Ask about Guildite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Guildite Specimen Label here :

Guildite

CuFe+++(SO4)2(OH)•4(H2O)
Dana No: 31.09.07.01 Strunz No: 07.DC.30
Locality:

Notes: