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.

Name Pronunciation:

Yavapaiite + Pronunciation

Yavapaiite Image

Images:

Yavapaiite

Comments: Translucent pale pinkish-tan colored crystal fragments.
Location: United Verde Mine, Jerome, Verde District, Black Hills (Black Hill Range), Yavapai Co., Arizona, USA. Scale: Fragment Size 1 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

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

Diaphaneity:

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
Ncalc = 1.63

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:

Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Yavapaiite =2.89 gm/cc.

Fermion Index:

Fermion Index = 0.0060301
Boson Index = 0.9939699

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)
Concentration of Yavapaiite per GRapi unit = 0.52 (%)

Estimated Radioactivity from Yavapaiite - barely detectable

Yavapaiite Classification

Dana Class:

28.03.04.01 (28)Anhydrous Acid and Sulfates

(28.03)(A++) XO4

(28.03.04)Dana Group

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

28.03.04.02 Eldfellite NaFe(SO4)2 C 2/m 2/m

Strunz Class:

07.AC.15 07 - SULFATES (SELENATES, TELLURATES)

07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O

07.AC -With medium-sized and large cations

07.AC.15 Yavapaiite KFe(SO4)2 C 2/m 2/m

07.AC.15 Eldfellite NaFe(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 - 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 Yavapaiite here :
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Print or Cut-and-Paste your Yavapaiite Specimen Label here :

Yavapaiite

KFe+++(SO4)2
Dana No: 28.03.04.01 Strunz No: 07.AC.15
Locality:

Notes: