Juanitaite Mineral Data

General Juanitaite Information

Chemical Formula:

(Cu,Ca,Fe)10Bi(AsO4)4(OH)11•2(H2O)

Composition:

Molecular Weight = 1,560.71 gm

Calcium 6.42 % Ca 8.98 % CaO

Iron 1.79 % Fe 2.30 % FeO

Copper 28.50 % Cu 35.68 % CuO

Bismuth 13.39 % Bi 14.93 % Bi₂O₃

Arsenic 19.20 % As 29.45 % As₂O₅

Hydrogen 0.97 % H 8.66 % H₂O

Oxygen 29.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₇Ca_2.5Fe²⁺_0.5Bi(AsO₄)₄(OH)₁₁•2(H₂O)

Environment:

Secondary mineral in copper arsenate and sulfate mineral assemblage from primary sulfide ores (tennantite, chalcopyrite, and pyrite). Chemically related to mixite.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Gold Hill mine, Tooele County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

The name is for Juanita Curtis who found the mineral.

Synonym:

IMA1999-022

Juanitaite Image

Images:

Juanitaite

Comments: Microplates of juanitaite on matrix. Scanning Electron Microscope Image.
Location: Gold Hill, Utah. Scale: Field of View 125 µm.
© William Wise

Images:

Juanitaite

Comments: Green juanitaite in quartz matrix, with conichalcite and sulfides.
Location: Gold Hill Mine, Tooele County, Utah, USA. Scale: 5.4 x 4 x 2.6 cm.
© Richard Dale / Dale Minerals

Juanitaite Crystallography

Axial Ratios:

a:c = 1:2.93042

Cell Dimensions:

a = 9.961, c = 29.19, Z = 4; V = 2,896.28 Den(Calc)= 3.58

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4₁/nnm

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

By Intensity(I/I_o): 14.6(1)(002), 6.34(0.7)(112), 3.146(0.6)(310,303),2.535(0.5)(228), 5.07(0.5)(114), 7.04(0.5)(110), 3.494(0.4), 3.518(0.4),

Forms:

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Forms: ( 3 1 0) ( 1 1 0) ( 0 0 1)

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Physical Properties of Juanitaite

Cleavage:

{001} Perfect, {110} Perfect, {100} Good

Color:

Olive green, Grass green.

Density:

3.61

Diaphaneity:

Translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Square - Occurs as square crystals in shape or outline.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

1 - Talc

Luster:

Resinous

Streak:

yellow

Optical Properties of Juanitaite

Gladstone-Dale:

CI meas= -0.123 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.132 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2081,KPDmeas= 0.2064,KC= 0.1838
Ncalc = 1.66

Optical Data:

Uniaxial (-), e=1.705, w=1.785, bire=0.0800.

Calculated Properties of Juanitaite

Electron Density:

Bulk Density (Electron Density)=3.37 gm/cc
note: Specific Gravity of Juanitaite =3.61 gm/cc.

Fermion Index:

Fermion Index = 0.0006102547
Boson Index = 0.9993897453

Photoelectric:

PE_Juanitaite= 258.60 barns/electron
U=PE_Juanitaite x rElectron Density= 870.91 barns/cc.

Radioactivity:

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

Juanitaite Classification

Dana Class:

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

(42.05)where (A)2 (XO4) Zq · x(H2O)

(42.05.04)Dana Group

42.05.04.01 Juanitaite! (Cu,Ca,Fe)10Bi(AsO4)4(OH)11•2(H2O) P 4₁/nnm 4/m 2/m 2/m

Strunz Class:

08.DE.40 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DE -With only medium-sized cations, (OH, etc.):RO4 = 3:1

08.DE.40 Juanitaite! (Cu,Ca,Fe)10Bi(AsO4)4(OH)11•2(H2O) P 4₁/nnm 4/m 2/m 2/m

Other Juanitaite Information

References:

NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(MinRec, Vol 31, No 4)

See Also:

Links to other databases for Juanitaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Ask about Juanitaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Juanitaite Specimen Label here :

Juanitaite

(Cu,Ca,Fe)10Bi(AsO4)4(OH)11•2(H2O)
Dana No: 42.05.04.01 Strunz No: 08.DE.40
Locality:

Notes: