Coconinoite Mineral Data

Coconinoite Mineral Data

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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:

MonoclinicSpace 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

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:

r_electron=2.70 gm/cc
note: r_Coconinoite=2.86 gm/cc.

Fermion Index

Fermion Index = 0.00414
Boson Index = 0.99586

Photoelectric:

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

Radioactivity:

GRapi = 2,491,383.74 (Gamma Ray American Petroleum Institute Units)

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	55,335,738	1.50E-03	2,491,383.74	819.09
100 gm / 4.06 cm	5,533,574	1.50E-04	249,138.37	81.91
10 gm / 1.88 cm	553,357	1.50E-05	24,913.84	8.19
1 gm / 8.74 mm	55,336	1.50E-06	2,491.38	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:

43.5.5.1 (43)Compound Phosphates, etc.

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

(43.5.5)Dana Group

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

Strunz Class:

VII/E.06-20 VII - Phosphates, Arsenates and Vanadates

VII/E - Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-

VII/E.06 - Vochtenite - Xiangjianite series

VII/E.06-10 Vochtenite (Fe,Mg)Fe[(UO2)(PO4)]4(OH)·12-13(H2O) Unk Mono

VII/E.06-20 Coconinoite Fe2Al2(UO2)2(PO4)4(SO4)(OH)2·18(H2O) C 2/c,Cc Mono

VII/E.06-30 Xiangjiangite (Fe,Al)(UO2)4(PO4)2(SO4)2(OH)·22(H2O) C 2/c or 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 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Uranium Minerals 13 -École des Mines de Paris

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

Coconinoite

Fe+++2Al2(UO2)2(PO4)4(SO4)(OH)2·18(H2O)
Dana No: 43.5.5.1 Strunz No: VII/E.06-20
Locality:

Notes: