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Alfredstelznerite

Additional Functions

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2
Solubility +++ HCl, ++ warmes H2O, dehydriert im Vakuum
Crystal System orthorhombisch, Pca21

Chemism

Chemical formula

Ca4(H2O)4[B4O4(OH)6]4(H2O)15

Additional chem. information

Neuer Strukturtyp

Chemical composition

Calcium, Bor, Sauerstoff, Wasserstoff

Unit weight: 1339.759884 u; Number of atoms in the formula: 141

Info

Empirical formula:

Ca4(H2O)4[B4O4(OH)6]4(H2O)15

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

4.66

62

43.97

1.0079470

62.4927140
Boron

B

12.91

16

11.35

10.8117000

172.9872000
Oxygen

O

70.46

59

41.84

15.9994300

943.9663700
Calcium

Ca

11.97

4

2.84

40.0784000

160.3136000

Analysis wt%

B2O3 : 41.57, CaO : 16.74, H2O : 41.69 (Ref: berechnet)

Strunz 9th edition incl. updates

6.

6: Borate

Lapis Classification

V/H.09-030

V: NITRATE, CARBONATE UND BORATE
H: Gruppenborate
9: Planare und tetraedrische Gruppen [B3O5] 1- bis [B6O10] 2-

Classification by Hölzel

6.DA.200

6: Borates
D: Tetraborates
A: Nesotetraborates
2: Borcarite-Group - 4(4T)

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.018
Birefringence chart\! Alfredstelznerite title=Birefringence chart Alfredstelznerite

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

1.476

RI value β

1.478

RI value γ / ε

1.494

Ri mean

1.483

2V angle

Biaxial (+) 39°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mm2

Space Group number

29

Space Group

Pca21

Cell parameters a (Å)

12.161

Cell parameters b (Å)

40.477

Cell parameters c (Å)

10.184

Cell parameters a/b or c/a

0.300

Cell parameters c/b

0.252

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

5012.98

Crystal structure

ermittelt

X-Ray Powder Diffraction

10.501(10), 9.992(5), 5.226(7), 4.623(6), 3.837(7), 3.118(7), 2.612(6), 2.538(6)
XRD chart Alfredstelznerite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

2

VHN (Hardness Vickers)

190 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

1.77 (gemessen) 1.775 (berechnet)

1.775 ( ρ calc. Mineralienatlas )

Instability

+++ HCl, ++ warmes H2O, dehydriert im Vakuum

(Co-)Type locality

(Co-)Type locality

Argentinien/Salta, Provinz/Sijes/Santa Rosa Mine

Preface

Author (Name, Year)

Galliski, M.A. et al., 2010

References

Galliski, M.A., Cooper, M.A., Márquez-Zavalía, M.F., Hawthorne, F.C.: Alfredstelznerite: a new species of calcium borate hydrate from the Santa Rosa mine, Salta, northwestern Argentina. Canadian Mineralogist 48 (2010) S. 123-128.

Neue Mineralien - IMA WEB Seite Feb. 2008

Other languages

German

Alfredstelznerit

Spanish

Alfredstelznerita

English

Alfredstelznerite

Russian

Альфредштельцнерит

CNMNC (IMA)-Number

IMA 2007-050

CNMNC symbol

Symbol

Asz

IDs

GUSID (Global unique identifier short form) 0BKa53Nl9EmVVFcR4sUw1Q
GUID (Global unique identifier) E79A12D0-6573-49F4-9554-5711E2C530D5
Database ID 4864