Triangulite Mineral Data

General Triangulite Information

Chemical Formula:

Al3(UO2)4(PO4)4(OH)5•5(H2O)

Composition:

Molecular Weight = 1,716.05 gm

Uranium 55.48 % U 62.94 % UO₂

Aluminum 4.72 % Al 8.91 % Al₂O₃

Phosphorus 7.22 % P 16.54 % P₂O₅

Hydrogen 0.88 % H 7.87 % H₂O

Oxygen 31.70 % O

______ ______

100.00 % 96.27 % = TOTAL OXIDE

Empirical Formula:

Al₃(UO₂)₄(PO₄)₄(OH)₅•5(H₂O)

Environment:

Complex pegmatite.

IMA Status:

Approved IMA 1982

Locality:

Kobokobo, Kivu, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named for the triangular habit of the crystals.

Name Pronunciation:

Triangulite + Pronunciation

Triangulite Image

Images:

Triangulite

Comments: Bright yellow triangulite filling vugs in rhyolite.
Location: Rhyolite Ridge, near Mina, Mineral County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Triangulite Crystallography

Axial Ratios:

a:b:c =0.9839:1:1.0037

Cell Dimensions:

a = 10.39, b = 10.56, c = 10.6, Z = 1; alpha = 116.4°, beta = 107.8°, gamma = 113.4° V = 910.28 Den(Calc)= 3.13

Crystal System:

TriclinicSpace Group: P1,P 1

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

By Intensity(I/I_o): 7.8(1), 3.87(0.8), 3.15(0.7),

Physical Properties of Triangulite

Cleavage:

{???} Perfect

Color:

Yellow, Bright yellow.

Density:

3.7

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.

Habit:

Triangular Crystals - Occurs as triangular shaped crystals.

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Non-fluorescent.

Streak:

light yellow

Optical Properties of Triangulite

Gladstone-Dale:

CI meas= -0.307 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.314 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1819,KPDmeas= 0.1809,KC= 0.1384
Ncalc = 1.51

Optical Data:

Biaxial (+), a=1.639, b=1.665, g=1.704, bire=0.0650, 2V(Calc)=82, 2V(Meas)=80.

Pleochroism (x):

pale greenish yellow.

Pleochroism (y):

pale greenish yellow.

Pleochroism (z):

bright yellow.

Calculated Properties of Triangulite

Electron Density:

Bulk Density (Electron Density)=3.25 gm/cc
note: Specific Gravity of Triangulite =3.70 gm/cc.

Fermion Index:

Fermion Index = 0.0041482439
Boson Index = 0.9958517561

Photoelectric:

PE_Triangulite=1,433.00 barns/electron
U=PE_Triangulite x r_electron=4,659.26 barns/cc.

Radioactivity:

GRapi = 4,155,878.82 (Gamma Ray American Petroleum Institute Units)
Concentration of Triangulite per GRapi unit = 240.62 (PPB)

Triangulite 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) 7.32 ± 1.83 grams of pure Triangulite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 731.89 ±182.97 grams of pure Triangulite .

**Estimated Radioactivity from Triangulite** - very strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.02 cm	99,314,296	2.68E-03	4,155,878.82	1,366.32
100 gm / 3.72 cm	9,931,430	2.68E-04	415,587.88	136.63
10 gm / 1.73 cm	993,143	2.68E-05	41,558.79	13.66
1 gm / 8.02 mm	99,314	2.68E-06	4,155.88	1.37
0.1 gm / 3.72 mm	9,931	2.68E-07	415.59	0.14
0.01 gm / 1.73 mm	993	2.68E-08	41.56	0.01
0.001 gm / 0.80 mm	99	2.68E-09	4.16	0.00

Weight of pure Triangulite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.70 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

Triangulite Classification

Dana Class:

40.02a.34.01 (40)Hydrated Phosphates, etc

(40.02a)where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++

(40.02a.34)Dana Group

40.02a.34.01 Triangulite Al3(UO2)4(PO4)4(OH)5•5(H2O) P1,P 1 Tri

Strunz Class:

08.EB.45 08 - PHOSPHATES, ARSENATES, VANADATES

08.E - Uranyl Phosphates and Arsenates

08.EB -UO2:RO4 = 1:1

08.EB.45 Triangulite Al3(UO2)4(PO4)4(OH)5•5(H2O) P1,P 1 Tri

Other Triangulite Information

References:

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

See Also:

Links to other databases for Triangulite :
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 - Uranium Minerals

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Ask about Triangulite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Triangulite

Al3(UO2)4(PO4)4(OH)5•5(H2O)
Dana No: 40.02a.34.01 Strunz No: 08.EB.45
Locality:

Notes: