Mineralogy Database

Triangulite Mineral Data

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General Triangulite Information

Help on Chemical  Formula: Chemical Formula: Al3(UO2)4(PO4)4(OH)5•5(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Al3(UO2)4(PO4)4(OH)5•5(H2O)
Help on Environment: Environment: Complex pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Kobokobo, Kivu, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the triangular habit of the crystals.
Help on Name Pronunciation: Name Pronunciation: Triangulite + Pronunciation Say TRIANGULITE
 

Triangulite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9839:1:1.0037
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic Space Group: P1,P 1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.8(1), 3.87(0.8), 3.15(0.7),
 

Physical Properties of Triangulite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Yellow, Bright yellow.
Help on Density: Density: 3.7
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Habit: Habit: Triangular Crystals - Occurs as triangular shaped crystals.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Streak: Streak: light yellow
 

Optical Properties of Triangulite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.639, b=1.665, g=1.704, bire=0.0650, 2V(Calc)=82, 2V(Meas)=80.
Help on Pleochroism (x): Pleochroism (x): pale greenish yellow.
Help on Pleochroism (y): Pleochroism (y): pale greenish yellow.
Help on Pleochroism (z): Pleochroism (z): bright yellow.
 

Calculated Properties of Triangulite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.25 gm/cc
note: Specific Gravity of Triangulite =3.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0041482439
Boson Index = 0.9958517561
Help on Photoelectric: Photoelectric: PETriangulite =1,433.00 barns/electron
U=PETriangulite x relectron=4,659.26 barns/cc.
Help on Radioactivity: 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
Bequerols
(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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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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Triangulite

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

 

Notes:

 

 
   
 


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