Sincosite Mineral Data

General Sincosite Information

Chemical Formula:

Ca(V++++O)2(PO4)2•5(H2O)

Composition:

Molecular Weight = 453.98 gm

Calcium 8.83 % Ca 12.35 % CaO

Vanadium 22.44 % V 40.06 % V₂O₅

Phosphorus 13.65 % P 31.27 % P₂O₅

Hydrogen 2.22 % H 19.84 % H₂O

Oxygen 52.86 % O

______ ______

100.00 % 103.52 % = TOTAL OXIDE

Empirical Formula:

CaV⁵⁺₂O₂(PO₄)₂•5(H₂O)

Environment:

Black, carbonaceous shale.

IMA Status:

Valid Species (Pre-IMA) 1924

Locality:

Sincos, Dept. Junin, Peru, about 160 km E of Lima. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Sincosite + Pronunciation

Synonym:

ICSD 67660

PDF 39-318

Sincosite Image

Images:

Minyulite Sincosite

Comments: Pale greenish white acicular radial sprays of minyulite to 8mm with small, green, tabular sincosite.
Location: Ross Hannibal mine, Lawrence County, South Dakota. Scale: Picture size 2 cm.
© Tom Loomis / Dakota Matrix

Images:

Sincosite

Comments: Tabular single crystals of sincosite to 2 mm on drusy quartz.
Location: Ross Hannibal Mine, Lawrence Co., South Dakota, USA. Scale: Picture size 1.5 cm.
© Tom Loomis / Dakota Matrix

Sincosite Crystallography

Axial Ratios:

a:c = 1:1.4308

Cell Dimensions:

a = 8.895, c = 12.727, Z = 4; V = 1,006.97 Den(Calc)= 2.99

Crystal System:

Tetragonal Space Group: P mmm or P 4/nmm

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

By Intensity(I/I_o): 6.28(1), 3.14(0.6), 3.35(0.2),

Forms:

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Forms: ( 1 0 0) ( 0 0 1)

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Physical Properties of Sincosite

Cleavage:

{001} Perfect, {100} Distinct, {110} Poor

Color:

Green, Yellowish green, Olive green, Brownish green.

Density:

2.97

Fracture:

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

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Scaly - Morphology like fish scales.

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Vitreous - Metallic

Streak:

light green

Optical Properties of Sincosite

Dichroism (e):

colorless or pale yellow.

Dichroism (w):

grayish green or grayish green.

Gladstone-Dale:

CI meas= 0.216 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.222 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2232,KPDmeas= 0.2247,KC= 0.2868
Ncalc = 1.85 - 1.86

Optical Data:

Uniaxial (-), e=1.655, w=1.68, bire=0.0250.

Calculated Properties of Sincosite

Electron Density:

Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Sincosite =2.97 gm/cc.

Fermion Index:

Fermion Index = 0.0009373131
Boson Index = 0.9990626869

Photoelectric:

PE_Sincosite= 5.94 barns/electron
U=PE_Sincosite x rElectron Density= 17.55 barns/cc.

Radioactivity:

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

Sincosite Classification

Dana Class:

42.11.19.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq ï¿½ x(H2O)

(42.11.19)Sincosite Group

42.11.19.01 Sincosite Ca(VO)2(PO4)2•5(H2O) P mmm or P 4/nmm Tetra

42.11.19.02 Bariosincosite! Ba(VO)2(PO4)2•4(H2O) P 4/n or P 4/nmm 4/m

42.11.19.03 Phosphovanadylite! (Ba,Ca,K,Na)x[(V,Al)4P2(O,OH)16]•12(H2O)x~0.66 I 43m 4 3m

Strunz Class:

08.CJ.65 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CJ -With only large cations

08.CJ.65 Sincosite Ca(VO)2(PO4)2•5(H2O) P mmm or P 4/nmm Tetra

08.CJ.65 Bariosincosite! Ba(VO)2(PO4)2•4(H2O) P 4/n or P 4/nmm 4/m

Other Sincosite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Sincosite :
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

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

Sincosite

Ca(V++++O)2(PO4)2•5(H2O)
Dana No: 42.11.19.01 Strunz No: 08.CJ.65
Locality:

Notes:

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