Triangulite
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About Triangulite
Formula:
Al3(UO2)4(PO4)4(OH)5 · 5H2O
Colour:
Bright yellow
Crystal System:
Triclinic
Name:
Named for the triangular habit of its crystals.
Type Locality:
Ranunculite-Triangulite Group
Classification of Triangulite
Approved
Approval Year:
1981
7/E.05-20
8.EB.45
8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
B : UO2:RO4 = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
B : UO2:RO4 = 1:1
40.2a.34.1
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
19.11.24
19 : Phosphates
11 : Phosphates of U
19 : Phosphates
11 : Phosphates of U
Pronounciation of Triangulite
Pronounciation:
Play | Recorded by | Country |
---|---|---|
Jolyon & Katya Ralph | United Kingdom |
Physical Properties of Triangulite
Colour:
Bright yellow
Optical Data of Triangulite
Type:
Biaxial (+)
RI values:
nα = 1.639 nβ = 1.665 nγ = 1.704
2V:
Measured: 80° , Calculated: 82°
Max Birefringence:
δ = 0.065

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively weak
Chemical Properties of Triangulite
Formula:
Al3(UO2)4(PO4)4(OH)5 · 5H2O
Crystallography of Triangulite
Crystal System:
Triclinic
Cell Parameters:
a = 10.39 Å, b = 10.56 Å, c = 10.6 Å
α = 116.4°, β = 107.8°, γ = 113.4°
α = 116.4°, β = 107.8°, γ = 113.4°
Ratio:
a:b:c = 0.984 : 1 : 1.004
Unit Cell V:
774.22 ų (Calculated from Unit Cell)
Type Occurrence of Triangulite
Synonyms of Triangulite
Other Language Names for Triangulite
Related Minerals - Nickel-Strunz Grouping
8.EB.05 | Autunite | Ca(UO2)2(PO4)2 · 11H2O | Orth. mmm (2/m 2/m 2/m) : Pnma |
8.EB.05 | Heinrichite | Ba(UO2)2(AsO4)2 · 10H2O | Mon. 2/m |
8.EB.05 | Kahlerite | Fe(UO2)2(AsO4)2 · 12H2O | Tet. 4/m : P42/n |
8.EB.05 | Nováčekite-I | Mg(UO2)2(AsO4)2 · 12H2O | Tric. 1 : P1 |
8.EB.05 | Saléeite | Mg(UO2)2(PO4)2 · 10H2O | Mon. 2/m : P21/b |
8.EB.05 | Torbernite | Cu(UO2)2(PO4)2 · 12H2O | Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm |
8.EB.05 | Uranocircite | Ba(UO2)2(PO4)2 · 10H2O | Tet. |
8.EB.05 | Uranospinite | Ca(UO2)(AsO4)2 · 10H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
8.EB.05 | Xiangjiangite | (Fe3+,Al)(UO2)4(PO4)2(SO4)2(OH) · 22H2O | Tet. |
8.EB.05 | Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O | Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm |
8.EB.05 | Metarauchite | Ni(UO2)2(AsO4)2 · 8H2O | Tric. 1 : P1 |
8.EB.05 | Rauchite | Ni(UO2)2(AsO4)2 · 10H2O | Tric. 1 : P1 |
8.EB.10 | Bassetite | Fe2+(UO2)2(PO4)2 · 10H2O | Mon. 2/m |
8.EB.10 | Lehnerite | Mn2+(UO2)2(PO4)2 · 8H2O | Mon. |
8.EB.10 | Meta-autunite | Ca(UO2)2(PO4)2 · 6-8H2O | Tet. 4/mmm (4/m 2/m 2/m) |
8.EB.10 | Metasaléeite | Mg(UO2)2(PO4)2 · 8H2O | |
8.EB.10 | Metauranocircite-I | Ba(UO2)2(PO4)2 · 7H2O | Mon. 2 : P21 |
8.EB.10 | Metauranospinite | Ca(UO2)2(AsO4)2 · 8H2O | Tet. 4/m : P42/n |
8.EB.10 | Metaheinrichite | Ba(UO2)2(AsO4)2 · 8H2O | Tet. 4mm |
8.EB.10 | Metakahlerite | Fe2+(UO2)2(AsO4)2 · 8H2O | Tric. 1 : P1 |
8.EB.10 | Metakirchheimerite | Co(UO2)2(AsO4)2 · 8H2O | Tric. 1 : P1 |
8.EB.10 | Metanováčekite | Mg(UO2)2(AsO4)2 · 8H2O | Tet. 4/m : P4/n |
8.EB.10 | Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O | Tet. 4/m : P4/n |
8.EB.10 | Metazeunerite | Cu(UO2)2(AsO4)2 · 8H2O | Tet. 4/m : P42/n |
8.EB.10 | Przhevalskite | Pb2(UO2)3(PO4)2(OH)4 · 3H2O | Orth. |
8.EB.10 | Meta-lodèvite | Zn(UO2)2(AsO4)2 · 10H2O | |
8.EB.15 | Abernathyite | K(UO2)(AsO4) · 3H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
8.EB.15 | Chernikovite | (H3O)2(UO2)2(PO4)2 · 6H2O | Tet. |
8.EB.15 | Meta-ankoleite | K2(UO2)2(PO4)2 · 6H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
8.EB.15 | Natrouranospinite | (Na2,Ca)(UO2)2(AsO4)2 · 5H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
8.EB.15 | Trögerite | (H3O)(UO2)(AsO4) · 3H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
8.EB.15 | Uramphite | (NH4)2(UO2)2(PO4)2 · 6H2O | Tet. |
8.EB.15 | Uramarsite | (NH4,H3O)2(UO2)2(AsO4,PO4)2 · 6H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm |
8.EB.20 | Threadgoldite | Al(UO2)2(PO4)2(OH) · 8H2O | Mon. |
8.EB.20 | Chistyakovaite | Al(UO2)2(AsO4)2(F,OH) · 6.5H2O | Mon. |
8.EB.25 | Arsenuranospathite | Al[(UO2)(AsO4)]2F(H2O)20 | Orth. mm2 : Pnn2 |
8.EB.25 | Uranospathite | (Al,☐)(UO2)2(PO4)2F · 20(H2O,F) | Orth. mm2 : Pnn2 |
8.EB.30 | Vochtenite | (Fe2+,Mg)Fe3+(UO2)4(PO4)4(OH) · 12-13H2O | Mon. |
8.EB.35 | Coconinoite | Fe3+2Al2(UO2)2(PO4)4(SO4)(OH)2 · 20H2O | Mon. |
8.EB.40 | Ranunculite | HAl(UO2)(PO4)(OH)3 · 4H2O | Mon. |
8.EB.50 | Furongite | Al13(UO2)7(PO4)13(OH)14 · 58H2O | Tric. 1 : P1 |
8.EB.55 | Sabugalite | HAl(UO2)4(PO4)4 · 16H2O | Mon. 2/m : B2/m |
Related Minerals - Hey's Chemical Index of Minerals Grouping
19.11.1 | Lermontovite | U(PO4)(OH) · H2O | Orth. mmm (2/m 2/m 2/m) : Ccca |
19.11.2 | Metavanmeersscheite | U6+(UO2)3(PO4)2(OH)6 · 2H2O | Orth. mmm (2/m 2/m 2/m) : Fddd |
19.11.3 | Vanmeersscheite | U6+(UO2)3(PO4)2(OH)6 · 4H2O | Orth. |
19.11.4 | Chernikovite | (H3O)2(UO2)2(PO4)2 · 6H2O | Tet. |
19.11.5 | Vyacheslavite | U(PO4)(OH) · nH2O | Orth. |
19.11.6 | Metanatroautunite | Na(UO2)(PO4)(H2O)3 | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
19.11.7 | Yingjiangite | K2Ca(UO2)7(PO4)4(OH)6 · 6H2O | Orth. mmm (2/m 2/m 2/m) : Cmcm |
19.11.8 | Meta-ankoleite | K2(UO2)2(PO4)2 · 6H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
19.11.9 | Uramphite | (NH4)2(UO2)2(PO4)2 · 6H2O | Tet. |
19.11.10 | Torbernite | Cu(UO2)2(PO4)2 · 12H2O | Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm |
19.11.11 | Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O | Tet. 4/m : P4/n |
19.11.12 | Saléeite | Mg(UO2)2(PO4)2 · 10H2O | Mon. 2/m : P21/b |
19.11.13 | Ningyoite | CaU(PO4)2 · 1-2H2O | Orth. |
19.11.14 | Meta-autunite | Ca(UO2)2(PO4)2 · 6-8H2O | Tet. 4/mmm (4/m 2/m 2/m) |
19.11.15 | Autunite | Ca(UO2)2(PO4)2 · 11H2O | Orth. mmm (2/m 2/m 2/m) : Pnma |
19.11.16 | Pseudo-autunite | (H3O)4Ca2(UO2)2(PO4)4 · 5H2O | Orth. |
19.11.17 | Phurcalite | Ca2(UO2)3(PO4)2O2 · 7H2O | Orth. |
19.11.18 | Phosphuranylite | (H3O)3KCa(UO2)7(PO4)4O4 · 8H2O | Orth. mmm (2/m 2/m 2/m) : Cmcm |
19.11.19 | Ulrichite | CaCu(UO2)(PO4)2 · 4H2O | Mon. |
19.11.20 | Bergenite | Ca2Ba4(UO2)9(PO4)6O6 · 16H2O | Mon. 2/m : P21/b |
19.11.21 | Metauranocircite-I | Ba(UO2)2(PO4)2 · 7H2O | Mon. 2 : P21 |
19.11.22 | Uranocircite | Ba(UO2)2(PO4)2 · 10H2O | Tet. |
19.11.23 | Ranunculite | HAl(UO2)(PO4)(OH)3 · 4H2O | Mon. |
19.11.25 | Mundite | Al(UO2)3(PO4)2(OH)3 · 5.5H2O | Orth. |
19.11.26 | Upalite | Al(UO2)3(PO4)2O(OH) · 7H2O | Mon. |
19.11.27 | Furongite | Al13(UO2)7(PO4)13(OH)14 · 58H2O | Tric. 1 : P1 |
19.11.28 | Threadgoldite | Al(UO2)2(PO4)2(OH) · 8H2O | Mon. |
19.11.29 | Phuralumite | Al2(UO2)3(PO4)3(OH)2 · 13H2O | Mon. |
19.11.30 | Moreauite | Al3(UO2)(PO4)3(OH)2 · 13H2O | |
19.11.31 | Sabugalite | HAl(UO2)4(PO4)4 · 16H2O | Mon. 2/m : B2/m |
19.11.32 | Uranospathite | (Al,☐)(UO2)2(PO4)2F · 20(H2O,F) | Orth. mm2 : Pnn2 |
19.11.33 | Althupite | AlTh(UO2)7(PO4)4(OH)5O2 · 15H2O | Tric. 1 : P1 |
19.11.34 | Françoisite-(Nd) | (Nd,Ce,Sm)(UO2)3(PO4)2O(OH) · 6H2O | Mon. |
19.11.35 | Kivuite | (Th,Ca,Pb)(UO2)4(HPO4)2(OH)8 · 7H2O | |
19.11.36 | Parsonsite | Pb2(UO2)(PO4)2 | Tric. 1 : P1 |
19.11.37 | Dewindtite | H2Pb3(UO2)2(PO4)4O4 · 12H2O | Orth. mmm (2/m 2/m 2/m) : Cmma |
19.11.38 | Dumontite | Pb2(UO2)3(PO4)2(OH)4 · 3H2O | Mon. 2/m : P21/m |
19.11.39 | Przhevalskite | Pb2(UO2)3(PO4)2(OH)4 · 3H2O | Orth. |
19.11.40 | Lehnerite | Mn2+(UO2)2(PO4)2 · 8H2O | Mon. |
19.11.41 | Bassetite | Fe2+(UO2)2(PO4)2 · 10H2O | Mon. 2/m |
19.11.42 | Vochtenite | (Fe2+,Mg)Fe3+(UO2)4(PO4)4(OH) · 12-13H2O | Mon. |
Fluorescence of Triangulite
Fluorescent bright green under SW UV (at least the Rhyolite Ridge, Nevada, material).
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Triangulite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bulletin de la Société française de Minéralogie et de Cristallographie (1982): 105: 611-614.
American Mineralogist (1984): 69: 212.
Internet Links for Triangulite
mindat.org URL:
https://www.mindat.org/min-4014.html
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Localities for Triangulite
Locality List




All localities listed without proper references should be considered as questionable.
DR Congo (TL) | |
| Bull.Minéral.(1982) 105, 611-614 |
Spain | |
| http://www.foro-minerales.com/forum/viewtopic.php?t=6707 |
USA | |
| NBMG Spec Pub 31 Minerals of Nevada |
Rhyolite Ridge Li-B Deposit, Esmeralda Co., Nevada, USA