Juanitaite Mineral Data

Juanitaite Mineral Data

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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 32.09 % Cu₂O

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 % 96.41 % = 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 ?m.
© 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

Diaphaniety:

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= -0.041 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2081,KPDmeas= 0.2064,KC= 0.1983

Optical Data:

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

Calculated Properties of Juanitaite

Electron Density:

r_electron=3.37 gm/cc
note: r_Juanitaite=3.61 gm/cc.

Fermion Index

Fermion Index = 0.00061
Boson Index = 0.99939

Photoelectric:

PE_Juanitaite= 258.60 barns/electron
U=PE_Juanitaite x r_electron= 870.91 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Juanitaite is Not Radioactive

Juanitaite Classification

Dana Class:

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

(42.5)where (A)2 (XO4) Zq · x(H2O)

(42.5.4)Dana Group

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

Strunz Class:

VII/D.53-95 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.53 - Mixite - Agardite group

VII/D.53-10 Petersite-(Y) (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6·3(H2O) P 6₃/m 6/m

VII/D.53-20 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6·3(H2O) Unk Hex

VII/D.53-30 Zalesiite! (Ca,Y)Cu6[(AsO4)2(AsO3OH)(OH)6]·3(H2O) P 6₃/m 6/m

VII/D.53-40 Agardite-(Y) (Y,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

VII/D.53-50 Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

VII/D.53-60 Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

VII/D.53-70 Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m

VII/D.53-80 Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m

VII/D.53-90 Mixite BiCu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

VII/D.53-95 Juanitaite (Cu,Ca,Fe)10Bi(AsO4)4(OH)11·2(H2O) P 4₁/nnm 4/m 2/m 2/m

VII/D.53-100 Mrazekite Bi2Cu3(PO4)2O2(OH)2·2(H2O) P 2₁/n 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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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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: 42.5.4.1 Strunz No: VII/D.53-95
Locality:

Notes: