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Wightmanite (Wightmanit)

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Wightmanit
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Wightmanit
beige, stengelige Aggreagte von Wightmanit, Crestmore Steinbrüche, Riverside County, Kalifornien, USA; BB ~ 1 cm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: USA/Kalifornien (California)/Riverside Co./Crestmore/Crestmore Quarries
Mineral: Wightmanite
Image: 1591731794
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Wightmanit

beige, stengelige Aggreagte von Wightmanit, Crestmore Steinbrüche, Riverside County, Kalifornien, USA; BB 1 cm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-06-09
Locality: Crestmore Quarries / Crestmore / Riverside Co. / Kalifornien (California) / USA

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 5.5
Solubility ++ Säuren
Crystal System monoklin, I2/m

Chemism

Chemical formula

Mg5(BO3)O(OH)5·2H2O

Chemical composition

Magnesium, Bor, Sauerstoff, Wasserstoff

Unit weight: 317.402253 u; Number of atoms in the formula: 26

Info

Empirical formula:

Mg5(BO3)O(OH)5·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.86

9

34.62

1.0079470

9.0715230

Boron

B

3.41

1

3.85

10.8117000

10.8117000

Oxygen

O

55.45

11

42.31

15.9994300

175.9937300

Magnesium

Mg

38.29

5

19.23

24.3050600

121.5253000

Analysis wt%

B2O3 : 12.20, MgO : 57.80, FeO : 2.20, Al2O3 : 2.10, CaO : 2.70, H2O : 21.50, Cl : 0.94, F : 1.80 (Ref: American Mineralogist 62)

Strunz 9th edition incl. updates

6.AB.55

6: Borate
A: Monoborate
B: BO3 mit zusätzlichen Anionen; 1(Δ) + OH, etc.
55:Wightmanit-Gruppe

Lapis Classification

V/G.06-020

V: NITRATE, CARBONATE UND BORATE
G: Inselborate
6: [BO3] 3--Inseln

Classification by Hölzel

6.AB.700

6: Borates
A: Monoborates
B: BO3, with additional anions - 1(P)+OH, etc.
7: Wightmanite-Group (homeotypes ?)

Dana 8th edition

26.01.02.01

26: Hydrated Borates Containing Hydroxyl or Halogen
01: Hydrated Borates Containing Hydroxyl or Halogen

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.019

Birefringence chart\! Wightmanite title=Birefringence chart Wightmanite

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

1.585

RI value β

1.603

RI value γ / ε

1.604

Ri mean

1.597

2V angle

Biaxial (-) 33°

Optical Data Luminescence

Color LW-UV (365nm)

 

gelbbraun

Color SW-UV (254nm)

 

gelbbraun

SW-UV Other Colors

 

blau

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

I2/m

Cell parameters a (Å)

13.46

Cell parameters b (Å)

3.102

Cell parameters c (Å)

18.17

Cell parameters a/b or c/a

4.339

Cell parameters c/b

5.858

Cell parameters α

90°

Cell parameters β

91.60

Cell parameters γ

90°

Z

4

Volumne (ų)

758.355

X-Ray Powder Diffraction

10.70(100),
9.07(100),
4.74(20),
3.03(30),
2.67(30),
2.446(20),
2.35(20),
2.12(20)

XRD chart Wightmanite

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)

5.5

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.60 (gemessen)

2.78 ( ρ calc. Mineralienatlas )

Instability

++ Säuren

Preface

Author (Name, Year)

Murdoch, 1962

References

American Mineralogist 47 (1962), 718

Other languages

German

Wightmanit

Spanish

Wightmanita

English

Wightmanite

French

Wightmanite

Simplified Chinese

韦氏硼镁石

CNMNC symbol

Symbol

Wmn

Locations with GPS information