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Overite (Overit)

Collectors Summary

Color hellgrün, farblos
Streak color weiß
Hardness (Mohs) 3.50 - 4.00
Solubility +++ Säuren
Crystal System orthorhombisch, Pbca

Chemism

Chemical formula

CaMgAl(PO4)2(OH)·4H2O

Chemical composition

Aluminium, Calcium, Magnesium, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 370.3766336 u; Number of atoms in the formula: 27

Info

Empirical formula:

CaMgAl(PO4)2(OH)·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.45

9

33.33

1.0079470

9.0715230

Oxygen

O

56.16

13

48.15

15.9994300

207.9925900

Magnesium

Mg

6.56

1

3.70

24.3050600

24.3050600

Aluminium

Al

7.28

1

3.70

26.9815382

26.9815382

Phosphorus

P

16.73

2

7.41

30.9737612

61.9475224

Calcium

Ca

10.82

1

3.70

40.0784000

40.0784000

Analysis wt%

CaO : 16.10, MgO : 11.20, Al2O3 : 13.70, P2O5 : 38.90, H2O : 22.04 (Ref: American Mineralogist 74)

Strunz 9th edition incl. updates

8.DH.20

8: Phosphate, Arsenate, Vanadate
D: Phosphate, mit weiteren Anionen, mit H2O
H: Mit großen und mittelgroßen [Kationen], (OH, etc.):RO4 < 1:1
20:Overit-Gruppe

Lapis Classification

VII/D.28-010

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

Classification by Hölzel

8.DL.100

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
L: very large=2, very small-medium=2+3
1: Segelerite-Group

Dana 8th edition

42.11.01.01

42: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
11: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where (AB)4 (XO4)3 Zq · x(H2O)
01: Overite Group

IMA status

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

Mineral status

anerkanntes Mineral

Optical Properties

Color

hellgrün, farblos

Streak color

weiß

max. Birefringence

0.012

Birefringence chart\! Overite title=Birefringence chart Overite

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

1.568

RI value β

1.574

RI value γ / ε

1.580

Ri mean

1.574

2V angle

Biaxial (-) 75°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

61

Space Group

Pbca

Cell parameters a (Å)

14.723

Cell parameters b (Å)

18.746

Cell parameters c (Å)

7.107

Cell parameters a/b or c/a

0.785

Cell parameters c/b

0.379

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volumne (ų)

1961.513

X-Ray Powder Diffraction

9.4(80),
5.29(60),
4.98(20),
3.70(50),
3.42(40),
3.05(30),
2.832(100),
1.975(50)

XRD chart Overite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.50 - 4.00

VHN (Hardness Vickers)

160 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.53 (gemessen)

2.508 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

USA/Utah/Utah Co./Oquirrh Mts./Fairfield/Clay Canyon

Preface

Author (Name, Year)

Larsen, 1938

References

Handbook of Mineralogy (Anthony et al.), 4 (2000), 425

Other languages

German

Overit

Spanish

Overita

English

Overite

French

Overite

Russian

Оверит

CNMNC symbol

Symbol

Ove

Locations with GPS information