Alfredstelznerite
A valid IMA mineral species
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Formula:
Ca4(H2O)4[B4O4(OH)6]4(H2O)15
Colour:
Colorless
Lustre:
Vitreous, Silky
Hardness:
2
Specific Gravity:
1.77
Crystal System:
Orthorhombic
Name:
Named for Alfred Wilhelm Stelzner [December 20, 1840 Dresden, Germany - February 25, 1895 Wiesbaden, Hesse, Germany]. Professor of mineralogy at the Bergakademie Freiberg.
This page provides mineralogical data about Alfredstelznerite.
Unique Identifiers
Mindat ID:
35790
Long-form identifier:
mindat:1:1:35790:4
GUID
(UUID V4):
(UUID V4):
e01ee70b-9119-4dab-80e3-bc0d4cfce190
IMA Classification of Alfredstelznerite
Classification of Alfredstelznerite
6.D0.
6 : BORATES
D : Tetraborates
0 :
6 : BORATES
D : Tetraborates
0 :
26.4.6.
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
4 : Tetraborates
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
4 : Tetraborates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Asz | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Alfredstelznerite
Vitreous, Silky
Transparency:
Transparent
Colour:
Colorless
Comment:
Aggregates are white.
Streak:
White
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Parallel to {010}.
Parallel to {010}.
Fracture:
Irregular/Uneven
Density:
1.77(1) g/cm3 (Measured) 1.775 g/cm3 (Calculated)
Optical Data of Alfredstelznerite
Type:
Biaxial (+)
RI values:
nα = 1.476(3) nβ = 1.478(3) nγ = 1.494(3)
2V:
Calculated: 39°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
None observed.
Optical Extinction:
X = b, Y = c, Z = a.
Pleochroism:
Not Visible
Chemistry of Alfredstelznerite
Mindat Formula:
Ca4(H2O)4[B4O4(OH)6]4(H2O)15
Elements listed:
Crystallography of Alfredstelznerite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pca21
Cell Parameters:
a = 12.161 Å, b = 40.477 Å, c = 10.1843 Å
Ratio:
a:b:c = 0.3 : 1 : 0.252
Unit Cell V:
5,013.13 ų (Calculated from Unit Cell)
Morphology:
Radial aggregates; sometimes parallel aggregates. Elongate along [001].
Type material: The forms observed are {010} dominant, {hk0}, {100}, {hkl}, and {hkl}.
Type material: The forms observed are {010} dominant, {hk0}, {100}, {hkl}, and {hkl}.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0006321 | Alfredstelznerite | Cooper M A, Hawthorne F C, Galliski M A, Marquez-Zavalia M F (2010) The crystal structure of alfredstelznerite, Ca4(H2O)4[B4O4(OH)6]4(H2O)15, a complex hydroxy-hydrated calcium borate mineral The Canadian Mineralogist 48 129-138 | 2010 | Santa Rosa mine, Sijes, Salta, Argentina | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
10.501 Å | (100) |
5.226 Å | (70) |
3.837 Å | (70) |
3.118 Å | (70 broad) |
4.623 Å | (60 broad) |
2.612 Å | (60) |
2.538 Å | (60) |
Comments:
Santa Rosa Mine, Argentina. Data from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
25 : Evaporites (prebiotic) |
Type Occurrence of Alfredstelznerite
General Appearance of Type Material:
White radial aggregates. The crystals are up to 5 mm long and 30 mm wide.
Place of Conservation of Type Material:
Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, Argentina, number MS003266.
Geological Setting of Type Material:
Sedimentary-evaporitic borate-bearing clays. Found immediately after the rainy season.
Synonyms of Alfredstelznerite
Fluorescence of Alfredstelznerite
Not fluorescent.
Other Information
Notes:
Dissolves slowly in warm water. Soluble in HCl, and the solution colors a flame yellowish green, as is typical of boron-bearing minerals.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Alfredstelznerite
mindat.org URL:
https://www.mindat.org/min-35790.html
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Please feel free to link to this page.
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References for Alfredstelznerite
Reference List:
Localities for Alfredstelznerite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Argentina (TL) | |
|
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