Yavapaiite Mineral Data

Yavapaiite Mineral Data +

General Yavapaiite Information

Chemical Formula:

KFe+++(SO4)2

Composition:

Molecular Weight = 287.07 gm

Potassium 13.62 % K 16.41 % K₂O

Iron 19.45 % Fe 27.81 % Fe₂O₃

Sulfur 22.34 % S 55.78 % SO₃

Oxygen 44.59 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KFe³⁺(SO₄)₂

Environment:

Crystal aggregates coating rubble with other secondary sulfates.

IMA Status:

Approved IMA 1959

Locality:

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

Name Origin:

Named for the Yavapai Indian tribe that inhabited the area of Arizona where the mineral was found.

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Yavapaiite Crystallography

Axial Ratios:

a:b:c =1.5819:1:1.5286

Cell Dimensions:

a = 8.152, b = 5.153, c = 7.877, Z = 2; beta = 94.9° V = 329.68 Den(Calc)= 2.89

Crystal System:

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

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

By Intensity(I/I_o): 2.97(1), 7.85(0.9), 3.87(0.8),

Crystal Structure:

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Graeber E J , Rosenzweig A , American Mineralogist , 56 (1971) p.1917-1933, The crystal structures of yavapaiite, KFe(SO4)2, and goldichite, KFe(SO4)2.4H2O

View Additional jPOWD Structure files for Yavapaiite
[1]

Physical Properties of Yavapaiite

Cleavage:

[001] Perfect, [100] Perfect, [110] Distinct

Color:

Light pink.

Density:

2.88

Diaphaniety:

Transparent

Fracture:

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

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous (Glassy)

Streak:

yellow white

Optical Properties of Yavapaiite

Gladstone-Dale:

CI meas= -0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2278,KPDmeas= 0.2286,KC= 0.2185

Optical Data:

Biaxial (-), a=1.593, b=1.684, g=1.698, bire=0.1050, 2V(Calc)=40, 2V(Meas)=30. Dispersion r > v strong.

Calculated Properties of Yavapaiite

Electron Density:

r_electron=2.84 gm/cc
note: r_Yavapaiite=2.89 gm/cc.

Fermion Index

Fermion Index = 0.00603
Boson Index = 0.99397

Photoelectric:

PE_Yavapaiite= 8.50 barns/electron
U=PE_Yavapaiite x r_electron= 24.14 barns/cc.

Radioactivity:

GRapi = 193.05 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Yavapaiite - barely detectable

Yavapaiite Classification

Dana Class:

28.3.4.1 (28)Anhydrous Acid and Sulfates

(28.3)(A++) XO4

(28.3.4)Dana Group

28.3.4.1 Yavapaiite KFe(SO4)2 C 2/m 2/m

Strunz Class:

VI/A.04-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/A - Waterfree sulfates [SO4]2- without unfamiliar anions. cations of medium and very big size

VI/A.04 - Vanthoffite - Yavapaiite series

VI/A.04-10 Vanthoffite Na6Mg(SO4)4 P 2₁/c 2/m

VI/A.04-20 Yavapaiite KFe(SO4)2 C 2/m 2/m

Other Yavapaiite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Yavapaiite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Yavapaiite Specimen Label here :

Yavapaiite

KFe+++(SO4)2
Dana No: 28.3.4.1 Strunz No: VI/A.04-20
Locality:

Notes: