Uhligite Mineral Data

Uhligite Mineral Data +

General Uhligite Information

Chemical Formula:

Ca3(Ti,Al,Zr)9O20

Composition:

Molecular Weight = 883.91 gm

Calcium 13.60 % Ca 19.03 % CaO

Zirconium 15.48 % Zr 20.91 % ZrO₂

Titanium 27.08 % Ti 45.18 % TiO₂

Aluminum 7.63 % Al 14.42 % Al₂O₃

Oxygen 36.20 % O

______ ______

100.00 % 99.55 % = TOTAL OXIDE

Empirical Formula:

Ca₃Ti₅Al_2.5Zr_1.5O₂₀

Environment:

Nepheline-syenite rocks.

IMA Status:

Valid Species (Pre-IMA) 1909

Locality:

Lake Magad, Rift Valley, Tanganyika Territory, Kenya, East Africa. Link to MinDat.org Location Data.

Name Origin:

Named for Alfred Louis Johannes Uhlig (1883-1919), German geologist, leader of the African expedition in which the material was first collected.

Uhligite Image

Images:

Uhligite

Comments: Black granular uhligite in syenite rock.
Location: near Lake Magadi, Rift Valley Province, Kenya. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Uhligite Crystallography

Cell Dimensions:

a = 7.639, Z = 1; V = 445.77 Den(Calc)= 3.29

Crystal System:

IsometricSpace Group: Unk

Physical Properties of Uhligite

Cleavage:

[001] Imperfect

Color:

Black.

Density:

4.15

Diaphaniety:

Subtranslucent to opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

5.5 - Knife Blade

Luster:

Metallic

Streak:

brownish gray

Optical Properties of Uhligite

Optical Data:

NCalc= 1.96 - from Gladstone-Dale relationship (KC = 0.2915) where Ncalc=Dcalc*KC+1
NCalc= 2.21 - from Gladstone-Dale relationship (KC = 0.2915) where Ncalc=Dmeas*KC+1

Calculated Properties of Uhligite

Electron Density:

r_electron=3.15 gm/cc
note: r_Uhligite=3.29 gm/cc.

Fermion Index

Fermion Index = 0.05274
Boson Index = 0.94726

Photoelectric:

PE_Uhligite= 27.29 barns/electron
U=PE_Uhligite x r_electron= 85.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Uhligite is Not Radioactive

Uhligite Classification

Dana Class:

8.7.2.1 (8)Multiple Oxides with Nb, Ta, and Ti

(8.7)Dana Type

(8.7.2)Dana Group

8.7.2.1 Uhligite Ca3(Ti,Al,Zr)9O20 Unk Cubic

Strunz Class:

IV/C.10-10 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.10 - Perowskite series

IV/C.10-10 Uhligite Ca3(Ti,Al,Zr)9O20 Unk Cubic

IV/C.10-20 Perovskite CaTiO3 P nma 2/m 2/m 2/m

IV/C.10-30 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m

IV/C.10-40 Tausonite SrTiO3 P m3m 4/m 3 2/m

IV/C.10-50 Loparite-(Ce) (Ce,Na,Ca)2(Ti,Nb)2O6 P m3m 4/m 3 2/m

IV/C.10-55 Isolueshite! (Na,La,Ca)(Nb,Ti)O3 P m3m 4/m 3 2/m

IV/C.10-60 Lueshite NaNbO3 P 222₁ 2 2 2

IV/C.10-70 Natroniobite NaNbO3 Mono

IV/C.10-80 Macedonite PbTiO3 P 4/mmm 4/m 2/m 2/m

Other Uhligite Information

References:

NAME( Ford32) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Uhligite :
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 -École des Mines de Paris

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

Uhligite

Ca3(Ti,Al,Zr)9O20
Dana No: 8.7.2.1 Strunz No: IV/C.10-10
Locality:

Notes: