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Zigrasite

Collectors Summary

Color gelblichweiß bis beigegelb
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 3
Cleavages unvollkommen (010) und (001)
Fracture hakig
Crystal System triklin, P1

Chemism

Chemical formula

MgZr(PO4)2·4H2O

Additional chem. information

Isochemisch mit Mahlmoodit

Chemical composition

Magnesium, Zirconium, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 377.5335184 u; Number of atoms in the formula: 24

Info

Empirical formula:

MgZr(PO4)2·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.14

8

33.33

1.0079470

8.0635760

Oxygen

O

50.85

12

50.00

15.9994300

191.9931600

Magnesium

Mg

6.44

1

4.17

24.3050600

24.3050600

Phosphorus

P

16.41

2

8.33

30.9737612

61.9475224

Zirconium

Zr

24.16

1

4.17

91.2242000

91.2242000

Analysis wt%

P2O5 : 37.59, ZrO2 : 32.27, MgO : 10.37, H2O : 18.60 (Ref: Mineralogical Magazine 2009)

Strunz 9th edition incl. updates

8.CE.75

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
E: Mit ausschließlich mittelgroßen Kationen, RO4:H2O = 1:2.5
75:

Lapis Classification

VII/C.09-100

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
C: Wasserhaltige Phosphate, ohne fremde Anionen
9: Kleine und mittelgroße Kationen: Be und Al-Mn-Fe-Cu-Zn-Mg

Classification by Hölzel

8.CC.610

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
C: Valency: 3,4 C medium
6: with Ti,Zr etc. Malhmoodite-Group

IMA status

Neue Mineralien Nov. 2008 - IMA-WEB-Seite [anerkannt]

Mineral status

anerkanntes Mineral

Optical Properties

Color

gelblichweiß bis beigegelb

Streak color

weiß

Lustre

Glasglanz

max. Birefringence

0.038

Birefringence chart\! Zigrasite title=Birefringence chart Zigrasite

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

1.597

RI value β

1.622

RI value γ / ε

1.635

Ri mean

1.618

2V angle

Biaxial (-) 66°

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

5.305

Cell parameters b (Å)

9.337

Cell parameters c (Å)

9.628

Cell parameters a/b or c/a

0.568

Cell parameters c/b

1.031

Cell parameters α

97.35

Cell parameters β

91.53

Cell parameters γ

90.52

Z

2

Volume (ų)

472.777

Crystal structure

F. C. Hawthorne, W. B. Simmons: The crystal structure of zigrasite, MgZr(PO4)2(H2O)4, a heteropolyhedral framework structure. Mineral Mag 74 (2010) S.567-575.

X-Ray Powder Diffraction

9.550(100), 4.589(40), 4.411(50), 4.108(70), 4.008(50), 3.569(30), 3.177(40), 2.660(30)

XRD chart Zigrasite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3

VHN (Hardness Vickers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.76 (gemessen)

2.652 ( ρ calc. Mineralienatlas )

Cleavages

unvollkommen (010) und (001)

Fracture

hakig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

USA/Maine/Oxford County/Newry/Dunton Gem Quarry

Preface

Author (Name, Year)

Frank C. Hawthorne, 2008

References

Neue Mineralien Nov. 2008 - IMA-WEB-Seite [anerkannt]

Other languages

German

Zigrasit

Spanish

Zigrasita

English

Zigrasite

CNMNC (IMA)-Number

IMA 2008-046

CNMNC symbol

Symbol

Zig

Locations with GPS information

IDs

GUSID (Global unique identifier short form) vlaGUXZeLUOyeNJzIVyK_g
GUID (Global unique identifier) 518656BE-5E76-432D-B278-D273215C8AFE
Database ID 5091