Santafeite Mineral Data

General Santafeite Information

Chemical Formula:

(Mn,Fe,Al,Mg)2(Mn++++,Mn++)2(Ca,Sr,Na)3(VO4,AsO4)4(OH)3•2(H2O)

Composition:

Molecular Weight = 896.52 gm

Sodium 3.59 % Na 4.84 % Na₂O

Strontium 6.84 % Sr 8.09 % SrO

Calcium 3.58 % Ca 5.00 % CaO

Magnesium 0.54 % Mg 0.90 % MgO

Manganese 20.83 % Mn 13.45 % MnO / 16.49 % MnO₂

Aluminum 0.60 % Al 1.14 % Al₂O₃

Vanadium 20.46 % V 36.52 % V₂O₅

Iron 0.62 % Fe 0.89 % Fe₂O₃

Arsenic 2.51 % As 3.85 % As₂O₅

Hydrogen 0.81 % H 7.23 % H₂O

Oxygen 39.62 % O

______ ______

100.00 % 98.39 % = TOTAL OXIDE

Empirical Formula:

Na_1.4Ca_0.8Sr_0.7Mn²⁺_1.4Mg_0.2Al_0.2Fe³⁺_0.1Mn⁴⁺_1.7Mn²⁺_0.3(VO₄)_3.6(AsO₄)_0.3 (OH)₃O_1.5�2.1(H₂O)

Environment:

Uranium-vanadium deposits in a sabka limestone.

IMA Status:

Valid Species (Pre-IMA) 1958

Locality:

Cliff face outcrop of the Todilto limestone, T13N-R10W Sec 25, Valencia county, New Mexico. Link to MinDat.org Location Data.

Name Origin:

Named after the Atchison, Topeka and Santa Fe Railroad Company, because if its contribution to the exploration and development of the New Mexico uranium deposits.

Name Pronunciation:

Santafeite + Pronunciation

Santafeite Image

Images:

Santafeite

Comments: Brownish-black silky santafeite in rusty quartz.
Location: Monument Valley, Navajo County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Santafeite Crystallography

Axial Ratios:

a:b:c =0.3083:1:0.211

Cell Dimensions:

a = 9.25, b = 30, c = 6.33, Z = 4; V = 1,756.57 Den(Calc)= 3.39

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: B2212

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

By Intensity(I/I_o): 14.9(1), 2.702(0.5), 7.47(0.5),

Physical Properties of Santafeite

Cleavage:

{010} Perfect, {110} Distinct

Color:

Black.

Density:

3.379

Diaphaneity:

Opaque to translucent

Fracture:

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

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Luster:

Subadamantine

Streak:

brown

Optical Properties of Santafeite

Gladstone-Dale:

CI meas= -0.049 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2979,KPDmeas= 0.2989,KC= 0.2848
Ncalc = 1.96 - 1.97

Optical Data:

Biaxial (?), a=2.01

Pleochroism (x):

dark reddish brown.

Pleochroism (z):

yellowish brown.

Calculated Properties of Santafeite

Electron Density:

Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Santafeite =3.39 gm/cc.

Fermion Index:

Fermion Index = 0.0062142415
Boson Index = 0.9937857585

Photoelectric:

PE_Santafeite= 19.36 barns/electron
U=PE_Santafeite x rElectron Density= 62.69 barns/cc.

Radioactivity:

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

Santafeite Classification

Dana Class:

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

(42.09)where (A)3 (XO4)2 Zq � x(H2O)

(42.09.06)Dana Group

42.09.06.01 Santafeite (Mn,Fe,Al,Mg)2(Mn,Mn)2(Ca,Sr,Na)3(VO4,AsO4)4(OH)3•2(H2O) B2212 2 2 2

Strunz Class:

08.DM.40 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DM -With large and medium-sized cations, (OH, etc.):RO4 > 2:1

08.DM.40 Santafeite (Mn,Fe,Al,Mg)2(Mn,Mn)2(Ca,Sr,Na)3(VO4,AsO4)4(OH)3•2(H2O) B2212 2 2 2

Other Santafeite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Santafeite :
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 Santafeite Specimen Label here :

Santafeite

(Mn,Fe,Al,Mg)2(Mn++++,Mn++)2(Ca,Sr,Na)3(VO4,AsO4)4(OH)3•2(H2O)
Dana No: 42.09.06.01 Strunz No: 08.DM.40
Locality:

Notes:

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