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Tristramite (Tristramit)

Collectors Summary

Color blassgelb, grüngelb
Hardness (Mohs) 3.00 - 4.00
Solubility +++ HCl
Crystal System hexagonal, P6222

Chemism

Chemical formula

(Ca,U4+,Fe3+)(PO4,SO4)·2H2O

Chemical composition

Calcium, Eisen, Phosphor, Sauerstoff, Schwefel, Uran, Wasserstoff

Unit weight: 232.3152978 u; Number of atoms in the formula: 12

Info

Empirical formula:

(Ca0.6U0.3Fe0.1)((PO4)0.75(SO4)0.25)·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.74

4

33.33

1.0079470

4.0317880
Oxygen

O

41.32

6

50.00

15.9994300

95.9965800
Phosphorus

P

10.00

0.75

6.25

30.9737612

23.2303209
Sulfur

S

3.45

0.25

2.08

32.0655000

8.0163750
Calcium

Ca

10.35

0.6

5.00

40.0784000

24.0470400
Iron

Fe

2.40

0.1

0.83

55.8452000

5.5845200
Uranium

U

30.74

0.3

2.50

238.0289130

71.4086739

Strunz 9th edition incl. updates

8.CJ.45

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
J: Ausschließlich mit großen Kationen
45:

Lapis Classification

VII/C.29-050

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
C: Wasserhaltige Phosphate, ohne fremde Anionen
29: Mittelgroße und große Kationen: Fe-Mn-Zn-Mg und Ca-(NH4) 1+; Rhabdophan-Gruppe

Classification by Hölzel

8.DP.100

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
P: With other Structures

Dana 8th edition

40.04.07.06

40: Hydrated Phosphates, etc
04: Hydrated Phosphates, etc where A+++ XO4 · x(H2O)
07: Rhabdophane Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Rhabdophane group

Optical Properties

Color

blassgelb, grüngelb

max. Birefringence

0.020
Birefringence chart\! Tristramite title=Birefringence chart Tristramite

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

1.644

RI value γ / ε

1.664

Ri mean

1.651

2V angle

Uniaxial (+)

Crystallography

Crystal System

hexagonal

Class (H-M)

622

Space Group number

180

Space Group

P6222

Cell parameters a (Å)

6.913

Cell parameters b (Å)

-

Cell parameters c (Å)

6.422

Cell parameters a/b or c/a

0.929

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

3

Volumne (ų)

265.787

X-Ray Powder Diffraction

5.99(40),
4.37(40),
3.46(30),
2.99(100),
2.83(100),
2.35(20),
2.14(50),
1.850(50)
XRD chart Tristramite

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

Physical Properties

Hardness (Mohs)

3.00 - 4.00

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.0 (gemessen)

4.354 ( ρ calc. Mineralienatlas )

Instability

+++ HCl

(Co-)Type locality

(Co-)Type locality

UK/England/Cornwall Co./Mount's Bay District/Breage/Rinsey/Wheal Trewavas

Preface

Author (Name, Year)

Atkin & Basham & Bowles, 1983

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: Ionizing radiation: Radioaktiv

References

Mineralogical Magazine 47 (1983), 393

IMA group assignments

 
Rhabdophane group
 
 
 

 
 
Brockite
(Ca,Th,Ce)(PO4)·H2O
hexagonal
P6222

 
 
Plumboan Rhabdophane
 
 
 

 
 
Rhabdophane-(Ce)
Ce(PO4)·H2O
hexagonal
P6222

 
 
Rhabdophane-(La)
La(PO4)·H2O
hexagonal
P6222

 
 
Rhabdophane-(Nd)
Nd(PO4)·H2O
hexagonal
P6222

 
 
Rhabdophane-(Y)
Y(PO4)·H2O
hexagonal
P6222

 
 
Tristramite
(Ca,U4+,Fe3+)(PO4,SO4)·2H2O
hexagonal
P6222

 
 
UM1993-07-PO:CaCeHLa
 
 
 

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Actuality: 23. Mar 2023 - 19:13:44

Other languages

German

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Tristramita

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Tristramite

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Tristramite

Russian

Тристрамит

https://catalogmineralov.ru/mineral/tristramite.html

Simplified Chinese

水磷钙铀矿

CNMNC (IMA)-Number

IMA 1982-037

CNMNC symbol

Symbol

Ttm

Locations with GPS information