Triangulite Mineral Data

Triangulite Mineral Data +

[Newest Minerals] [Minerals for Sale] [Educational Articles] [About Us] [Image Gallery]
John Betts - Fine Minerals
Classic minerals, out-of-print books & magazines, plus informative articles for collectors

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.

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= -0.545 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2138,KPDmeas= 0.1809,KC= 0.1384

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:

r_electron=3.25 gm/cc
note: r_Triangulite=3.70 gm/cc.

Fermion Index

Fermion Index = 0.00414
Boson Index = 0.99586

Photoelectric:

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

Radioactivity:

GRapi = 4,155,876.58 (Gamma Ray American Petroleum Institute Units)

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) 731.90 ±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	99,314,284	2.68E-03	4,155,876.58	1,366.32
100 gm / 3.72 cm	9,931,428	2.68E-04	415,587.66	136.63
10 gm / 1.73 cm	993,143	2.68E-05	41,558.77	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:

40.2a.34.1 (40)Hydrated Phosphates, etc

(40.2a)where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++

(40.2a.34)Dana Group

40.2a.34.1 Triangulite Al3(UO2)4(PO4)4(OH)5·5(H2O) P1,P 1 Tri

Strunz Class:

VII/E.05-20 VII - Phosphates, Arsenates and Vanadates

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

VII/E.05 - Ranunculite - Moreauite series

VII/E.05-10 Ranunculite HAl(UO2)(PO4)(OH)3·4(H2O) Unk (pseudo ORTH) Mono

VII/E.05-20 Triangulite Al3(UO2)4(PO4)4(OH)5·5(H2O) P1,P 1 Tri

VII/E.05-30 Upalite Al(UO2)3(PO4)2O(OH)·7(H2O) P 2₁/a 2/m

VII/E.05-40 Threadgoldite Al(UO2)2(PO4)2(OH)·8(H2O) C 2/c 2/m

VII/E.05-50 Furongite Al2(UO2)(PO4)3(OH)2·8(H2O) P1 1

VII/E.05-60 Moreauite Al3(UO2)(PO4)3(OH)2·13(H2O) P 2₁/c 2/m

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Uranium Minerals 13 -École des Mines de Paris

Search for Triangulite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Triangulite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Triangulite Mineral Data :

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: 40.2a.34.1 Strunz No: VII/E.05-20
Locality:

Notes: