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 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 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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