Curetonite Mineral Data

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General Curetonite Information

Chemical Formula:

Ba4Al3Ti(PO4)4(O,OH)6

Composition:

Molecular Weight = 1,160.06 gm

Barium 47.35 % Ba 52.87 % BaO

Titanium 4.13 % Ti 6.89 % TiO₂

Aluminum 6.98 % Al 13.18 % Al₂O₃

Phosphorus 10.68 % P 24.47 % P₂O₅

Hydrogen 0.52 % H 4.66 % H₂O

Oxygen 30.34 % O

______ ______

100.00 % 102.07 % = TOTAL OXIDE

Empirical Formula:

Ba₄Al₃Ti(PO₄)₄(OH)₆

Environment:

Massive barite in phosphatic, black organic cherts and shales is cut by veins of coarse-grained barite, euhedral adularia, and curetonite.

IMA Status:

Approved IMA 1979

Locality:

Barite Mine at Golconda, Nevada, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Forrest Cureton, mineralogist, and Michael Cureton, of Tucson, AZ, who found the mineral.

Synonym:

ICSD 75287

PDF 33-134

Curetonite Image

Images:

Curetonite

Comments: Translucent tabular crystal of curetonite in crystalline barite.
Location: Near Golconda, Humboldt County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Curetonite Crystallography

Axial Ratios:

a:b:c =0.5543:1:0.4159

Cell Dimensions:

a = 6.957, b = 12.55, c = 5.22, Z = 1; beta = 102.15° V = 445.55 Den(Calc)= 4.32

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.23(1), 3.286(0.8), 1.687(0.7),2.2(0.6), 2.25(0.6), 2.82(0.6), 2.99(0.6), 4.29(0.5),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Cooper M A , Hawthorne F C , American Mineralogist , 79 (1994) p.545-549, The crystal structure of curetonite, a complex heteropolyhedral sheet mineral, Data has been corrected according to the ICSD

Physical Properties of Curetonite

Cleavage:

{011} Good, {010} Parting

Color:

Bright yellowish green, Nickel green.

Density:

4.31

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Curetonite

Gladstone-Dale:

CI meas= 0.132 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.134 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1581,KPDmeas= 0.1585,KC= 0.1826
Ncalc = 1.79

Optical Data:

Biaxial (+), a=1.676, b=1.68, g=1.693, bire=0.0170, 2V(Calc)=60, 2V(Meas)=60. Dispersion weak, r < v.

Pleochroism (x):

yellow.

Pleochroism (y):

yellow.

Pleochroism (z):

yellow.

Calculated Properties of Curetonite

Electron Density:

Bulk Density (Electron Density)=3.92 gm/cc
note: Specific Gravity of Curetonite =4.31 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Curetonite= 210.40 barns/electron
U=PE_Curetonite x rElectron Density= 823.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Curetonite is Not Radioactive

Curetonite Classification

Dana Class:

41.05.15.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.15)Dana Group

41.05.15.01 Curetonite Ba4Al3Ti(PO4)4(O,OH)6 P 2₁/n 2/m

Strunz Class:

08.BK.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BK -With medium-sized and large cations, (OH, etc.)

08.BK.15 Curetonite Ba4Al3Ti(PO4)4(O,OH)6 P 2₁/n 2/m

Other Curetonite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Curetonite :
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 - WWW-MINCRYST

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Ask about Curetonite 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 Curetonite Specimen Label here :

Curetonite

Ba4Al3Ti(PO4)4(O,OH)6
Dana No: 41.05.15.01 Strunz No: 08.BK.15
Locality:

Notes: