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Quadruphite (Quadruphita)

Collectors Summary

Color hellbraun
Streak color weiß
Lustre Glasglanz, Harzglanz auf Brüchen, Perlglanz, Diamantglanz auf Spaltflächen
Hardness (Mohs) 5
Cleavages vollkommen {001} und weniger vollkommen {110},{100}
Fracture treppenartig
Solubility +++ HCl
Crystal System triklin, P1

Chemism

Chemical formula

Na14Ca2Ti4(Si2O7)2(PO4)4O4F2

Chemical composition

Calcium, Natrium, Silicium, Titan, Fluor, Phosphor, Sauerstoff

Unit weight: 1411.6965741 u; Number of atoms in the formula: 64

Info

Empirical formula:

Na14Ca2Ti4(Si2O7)2(PO4)4O4F2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

38.53

34

53.13

15.9994300

543.9806200

Fluorine

F

2.69

2

3.13

18.9984033

37.9968065

Sodium

Na

22.80

14

21.88

22.9897702

321.8567828

Silicon

Si

7.96

4

6.25

28.0855300

112.3421200

Phosphorus

P

8.78

4

6.25

30.9737612

123.8950448

Calcium

Ca

5.68

2

3.13

40.0784000

80.1568000

Titanium

Ti

13.56

4

6.25

47.8671000

191.4684000

Analysis wt%

Na2O : 28.10, SrO : 0.40, BaO : 1.10, CaO : 5.30, MgO : 1.10, MnO : 4.30, SiO2 : 16.50, ZrO2 : 4.10, TiO2 : 13.70, Nb2O5 : 3.80, P2O5 : 19.20, F : 3.40 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 92)

Strunz 9th edition incl. updates

9.BE.45

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
E: Si2O7 Gruppen mit zusätzlichen Anionen; Kationen in oktahedraler [6] und größerer Koordination
45:Quadruphit-Gruppe

Lapis Classification

VIII/C.14-120

VIII: SILIKATE
C: Gruppensilikate
14: Gruppensilikate [Si2O7] 6-, mit tetraederfremden Anionen (O,OH,F); Reihe Murmanit-Lomonosovit

Classification by Hölzel

9.BI.180

9: SILICATES
B: Sorosilicates
I: Murmanite-Group

Dana 8th edition

43.05.19.01

43: Compound Phosphates, etc.
05: Compound Phosphates, etc. (Hydrated Compound Anions With Hydroxyl or Halogen)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Seidozerite supergroup  ⇒ Murmanite group

Optical Properties

Color

hellbraun

Streak color

weiß

Diaphaneity (Transparency)

transparent, durchscheinend

Lustre

Glasglanz, Harzglanz auf Brüchen, Perlglanz, Diamantglanz auf Spaltflächen

max. Birefringence

0.067

Birefringence chart\! Quadruphite title=Birefringence chart Quadruphite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.630

RI value β

1.678

RI value γ / ε

1.697

Ri mean

1.668

2V angle

Biaxial (-) 62° (gemessen) 63° (berechnet)

Orientation

X ^ c = 28°, Y ^ c = 71°, Z ^ c = 70°

Dispersion

Stark; r < v

Absorption

Z ≥ Y > X

Pleochroism

X = farblos, Y = Z = gelblich

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

1

Space Group

P1

Cell parameters a (Å)

5.421

Cell parameters b (Å)

7.085

Cell parameters c (Å)

20.364

Cell parameters a/b or c/a

0.765

Cell parameters c/b

2.874

Cell parameters α

86.88

Cell parameters β

94.42

Cell parameters γ

89.93

Z

1

Volume (ų)

778.643

X-Ray Powder Diffraction

2.880(100),
2.702(80),
2.636(70),
2.050(50),
1.772(20),
1.713(30),
1.662(40),
1.600(50)

XRD chart Quadruphite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.12 (gemessen)

3.01 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001} und weniger vollkommen {110},{100}

Fracture

treppenartig

Tenacity

spröde

Instability

+++ HCl

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Alluaiv

Type material

A. E. Fersman Mineralogical Museum, Academy of Sciences, Moskau, Russland

The Natural History Museum, London, England

Collection number of type material

p545/5 (Moskau); 1994,25 (London)

Preface

Name from

Aus dem Lateinischen quadruplex, für vier und Phosphor für die vier Phosphatanionen in der chemischen Formel.

Author (Name, Year)

Khomyakov & Nechelyustov & Sokolova & Dorokhova, 1992

References

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 121(1) (1992), 105

Canadian Mineralogist 39 (2001), 1275

Canadian Mineralogist 44 (2006), 1273

IMA group assignments

Other languages

Spanish

Cuadrufita

German

Quadruphit

English

Quadruphite

French

Quadruphite

Russian

Квадруфит

Alternative Name

Spanish

Quadruphita

CNMNC symbol

Symbol

Qua

Locations with GPS information

IDs

GUSID (Global unique identifier short form) KBHORKXNRU28lnz8_Q0mAQ
GUID (Global unique identifier) 44CE1128-CDA5-4D45-BC96-7CFCFD0D2601
Database ID 3183