Grantsite Mineral Data

Grantsite Mineral Data +

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General Grantsite Information

Chemical Formula:

Na4CaxV++++2xV+++++12-2xO32·8(H2O)

Composition:

Molecular Weight = 1,379.40 gm

Sodium 6.67 % Na 8.99 % Na₂O

Calcium 1.45 % Ca 2.03 % CaO

Vanadium 44.32 % V 6.01 % VO₂ / 72.52 % V₂O₅

Hydrogen 1.17 % H 10.45 % H₂O

Oxygen 46.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₄Ca_0.5V⁴⁺V⁵⁺₁₁O₃₂·8(H₂O)

Environment:

Sandstone-hosted uranium-vanadium deposits.

IMA Status:

Approved IMA 1961

Locality:

F-33 mine (T12N-R9W Sec 33) 10 km NE of Grants, Valencia County, New Mexico. Link to MinDat.org Location Data.

Name Origin:

Named after the town of Grants, New Mexico.

Grantsite Image

Images:

Grantsite Tyuyamunite

Comments: Dark olive green waxy coatings of grantsite with greenish-yellow tyuyamunite and sandstone.
Location: F-33 Mine, near Grants, Valencia County, New Mexico, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Grantsite Crystallography

Axial Ratios:

a:b:c =4.8736:1:3.4472

Cell Dimensions:

a = 17.545, b = 3.6, c = 12.41, Z = 1; beta = 95.25° V = 780.55 Den(Calc)= 2.93

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 8.74(1), 3.61(0.3), 12.4(0.18),

Physical Properties of Grantsite

Color:

Green black, Dark green, Olive green.

Density:

2.94

Fracture:

Elastic - Fragments which spring back after bending.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Silky

Streak:

brownish green

Optical Properties of Grantsite

Optical Data:

Biaxial (-), a=1.82

Calculated Properties of Grantsite

Electron Density:

r_electron=2.83 gm/cc
note: r_Grantsite=2.93 gm/cc.

Fermion Index

Fermion Index = 0.00135
Boson Index = 0.99865

Photoelectric:

PE_Grantsite= 8.76 barns/electron
U=PE_Grantsite x r_electron= 24.78 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Grantsite is Not Radioactive

Grantsite Classification

Dana Class:

47.3.1.5 (47)Vanadium Oxysalts

(47.3)(Hydrated)

(47.3.1)Dana Group

47.3.1.1 Hewettite CaV6O16·9(H2O) P 2/m 2/m

47.3.1.2 Metahewettite CaV6O16·3(H2O) A2/m 2/m

47.3.1.3 Barnesite Na2V6O16·3(H2O) P 2/m 2/m

47.3.1.4 Hendersonite Ca1.3V6O16·6(H2O) Pnam 2/m 2/m 2/m

47.3.1.5 Grantsite Na4CaxV2xV12-2xO32·8(H2O) C 2/m 2/m

Strunz Class:

IV/G.12-20 IV - Oxides

IV/G - Vanadiumoxides (with V4+/5+) Layered vanadates. Typical Vanadiumbronzes

IV/G.12 - Barnessite - Metahewettite series

IV/G.12-10 Barnesite Na2V6O16·3(H2O) P 2/m 2/m

IV/G.12-20 Grantsite Na4CaxV2xV12-2xO32·8(H2O) C 2/m 2/m

IV/G.12-30 Hendersonite Ca1.3V6O16·6(H2O) Pnam 2/m 2/m 2/m

IV/G.12-40 Hewettite CaV6O16·9(H2O) P 2/m 2/m

IV/G.12-50 Metahewettite CaV6O16·3(H2O) A2/m 2/m

Other Grantsite Information

References:

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

See Also:

Links to other databases for Grantsite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Grantsite

Na4CaxV++++2xV+++++12-2xO32·8(H2O)
Dana No: 47.3.1.5 Strunz No: IV/G.12-20
Locality:

Notes: