Coconinoite Mineral Data

General Coconinoite Information

Chemical Formula:

Fe+++2Al2(UO2)2(PO4)4(SO4)(OH)2•18(H2O)

Composition:

Molecular Weight = 1,539.95 gm

Uranium 30.91 % U 35.07 % UO₂

Aluminum 3.50 % Al 6.62 % Al₂O₃

Iron 7.25 % Fe 10.37 % Fe₂O₃

Phosphorus 8.05 % P 18.43 % P₂O₅

Hydrogen 2.49 % H 22.23 % H₂O

Sulfur 2.08 % S 5.20 % SO₃

Oxygen 45.71 % O

______ ______

100.00 % 97.92 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₂Al₂(UO₂)₂(PO₄)₄(SO₄)(OH)₂•18(H₂O)

IMA Status:

Approved IMA 1966

Locality:

Sun Valley mine, Coconino County, Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named for its locality.

Coconinoite Image

Images:

Coconinoite

Comments: Dull, putty-colored clay-like mass of coconinoite on a sandstone matrix.
Location: Jomas mine, White Canyon, San Juan County, Utah, USA. Scale: Picture size 1.2 cm.
© Paul M. Schumacher

Images:

Coconinoite

Comments: Pale yellow coatings of coconinoite on sandstone.
Location: Jomac Mine, White Canyon, San Juan County, Utah. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Coconinoite Crystallography

Axial Ratios:

a:b:c =0.9637:1:1.7733

Cell Dimensions:

a = 12.5, b = 12.97, c = 23, Z = 4; beta = 106.6° V = 3,573.47 Den(Calc)= 2.86

Crystal System:

Monoclinic Space Group: C 2/c,Cc

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

By Intensity(I/I_o): 11.1(1), 3.29(0.8), 3.74(0.8),

Physical Properties of Coconinoite

Color:

Yellow, Cream yellow, Light yellow.

Density:

2.7

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

1-2 - Between Talc and Gypsum

Streak:

white

Optical Properties of Coconinoite

Gladstone-Dale:

CI meas= -0.067 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2014,KPDmeas= 0.2133,KC= 0.2
Ncalc = 1.54 - 1.57

Optical Data:

Biaxial (-), a=1.55, b=1.588, g=1.59, bire=0.0400, 2V(Calc)=24, 2V(Meas)=40.

Pleochroism (x):

colorless.

Pleochroism (y):

pale yellow.

Pleochroism (z):

pale yellow.

Calculated Properties of Coconinoite

Electron Density:

Bulk Density (Electron Density)=2.70 gm/cc
note: Specific Gravity of Coconinoite =2.86 gm/cc.

Fermion Index:

Fermion Index = 0.0041427783
Boson Index = 0.9958572217

Photoelectric:

PE_Coconinoite= 744.75 barns/electron
U=PE_Coconinoite x r_electron=2,013.88 barns/cc.

Radioactivity:

GRapi = 2,491,385.06 (Gamma Ray American Petroleum Institute Units)
Concentration of Coconinoite per GRapi unit = 401.38 (PPB)

Coconinoite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 12.21 ± 3.05 grams of pure Coconinoite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1220.9 ±305.22 grams of pure Coconinoite .

**Estimated Radioactivity from Coconinoite** - very strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.74 cm	55,335,743	1.50E-03	2,491,385.06	819.09
100 gm / 4.06 cm	5,533,574	1.50E-04	249,138.51	81.91
10 gm / 1.88 cm	553,357	1.50E-05	24,913.85	8.19
1 gm / 8.74 mm	55,336	1.50E-06	2,491.39	0.82
0.1 gm / 4.06 mm	5,534	1.50E-07	249.14	0.08
0.01 gm / 1.88 mm	553	1.50E-08	24.91	0.01
0.001 gm / 0.87 mm	55	1.50E-09	2.49	0.00

Weight of pure Coconinoite in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.86 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem

Coconinoite Classification

Dana Class:

43.05.05.01 (43)Compound Phosphates, etc.

(43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.05.05)Dana Group

43.05.05.01 Coconinoite Fe2Al2(UO2)2(PO4)4(SO4)(OH)2•18(H2O) C 2/c,Cc Mono

Strunz Class:

08.EB.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.E - Uranyl Phosphates and Arsenates

08.EB -UO2:RO4 = 1:1

08.EB.35 Coconinoite Fe2Al2(UO2)2(PO4)4(SO4)(OH)2•18(H2O) C 2/c,Cc Mono

Other Coconinoite Information

References:

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

See Also:

Links to other databases for Coconinoite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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Coconinoite

Fe+++2Al2(UO2)2(PO4)4(SO4)(OH)2•18(H2O)
Dana No: 43.05.05.01 Strunz No: 08.EB.35
Locality:

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