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Santafeite (Santafeit)

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Santafeit
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Santafeit
braune, dendritische Aggregate von Santafeit, Molinello Mine, Ne, Graveglia-Tal, Genua, Ligurien, Italien; BB ~ 1 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Miniera di Molinello
Mineral: Santafeite
Image: 1587394787
License: Usage for Mineralienatlas project only
Santafeit

braune, dendritische Aggregate von Santafeit, Molinello Mine, Ne, Graveglia-Tal, Genua, Ligurien, Italien; BB 1 mm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-04-20
Locality: Miniera di Molinello / Val Graveglia / Ne / Genua (Genova), Metropolitanstadt / Ligurien (Liguria), Region / Italien

Collectors Summary

Color schwarz
Streak color braun
Solubility +++ Säuren
Crystal System orthorhombisch, B2212

Chemism

Chemical formula

(Na,Ca,Sr)3(Mn2+,Fe3+)2Mn24+[(OH)5|(VO4)4]·2H2O

Chemical composition

Calcium, Eisen, Mangan, Natrium, Strontium, Sauerstoff, Vanadium, Wasserstoff

Unit weight: 904.76867401 u; Number of atoms in the formula: 43

Info

Empirical formula:

(Na0.6Ca0.3Sr0.1)3(Mn0.75Fe0.25)2Mn2[(OH)5(VO4)4]·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.00

9

20.93

1.0079470

9.0715230

Oxygen

O

40.67

23

53.49

15.9994300

367.9868900

Sodium

Na

4.57

1.8

4.19

22.9897702

41.3815864

Calcium

Ca

3.99

0.9

2.09

40.0784000

36.0705600

Vanadium

V

22.52

4

9.30

50.9415100

203.7660400

Manganese

Mn

21.25

3.5

8.14

54.9380499

192.2831747

Iron

Fe

3.09

0.5

1.16

55.8452000

27.9226000

Strontium

Sr

2.91

0.3

0.70

87.6210000

26.2863000

Analysis wt%

Al2O3 : 1.10, Fe2O3 : 1.10, MgO : 0.90, MnO : 13.30, CaO : 5.20, SrO : 8.50, Na2O : 5.00, MnO2 : 16.50, V2O5 : 36.50, As2O5 : 3.20, H2O : 8.80 (Ref: Mineralogical Magazine 86)

Strunz 9th edition incl. updates

8.DM.40

8: Phosphate, Arsenate, Vanadate
D: Phosphate, mit weiteren Anionen, mit H2O
M: Mit großen und mittelgroßen [Kationen], (OH, etc.):RO4 > 2:1
40:Santafeit-Gruppe

Lapis Classification

VII/D.45-010

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
D: Wasserhaltige Phosphate, mit fremden Anionen
45: Mittelgroße und sehr große Kationen: Al-Mg und Ca-Na-K

Classification by Hölzel

8.DJ.300

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
J: Lavendulan-Group

Dana 8th edition

42.09.06.01

42: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
09: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where (A)3 (XO4)2 Zq · x(H2O)

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

schwarz

Streak color

braun

RI value α / ω / n

2.01

2V angle

Biaxial

Crystallography

Crystal System

orthorhombisch

Class (H-M)

222

Space Group number

20

Space Group

B2212

Cell parameters a (Å)

9.25

Cell parameters b (Å)

30.00

Cell parameters c (Å)

6.33

Cell parameters a/b or c/a

0.308

Cell parameters c/b

0.211

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

1756.575

X-Ray Powder Diffraction

14.88(100),
7.47(50),
3.66(30),
3.39(30),
2.908(30),
2.788(40),
2.702(50),
1.667(40)

XRD chart Santafeite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Density (g/cm³)

3.379 (gemessen)

3.421 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

USA/New Mexico/McKinley Co./Grants District/Unnamed Mine

Preface

Author (Name, Year)

Sun & Weber, 1958

References

Handbook of Mineralogy (Anthony et al.), 4 (2000), 519

Other languages

German

Santafeit

English

Santafeite

French

Santafeite

Spanish

Santafeíta

Japanese

サンタフェアイト

CNMNC symbol

Symbol

Sfe

Locations with GPS information