Schlegelite
A valid IMA mineral species
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About Schlegelite
Formula:
Bi7(AsO4)3(MoO4)2O4
Colour:
Yellow
Lustre:
Adamantine
Hardness:
3½
Specific Gravity:
7.23 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Fritz Herrmann Schlegel (12 March 1938, Bärenstein, Saxony, Germany - 2012), mineral collector of Schneeberg, Germany, who first found the new mineral. He discovered eight minerals from the area.
This page provides mineralogical data about Schlegelite.
Unique Identifiers
Mindat ID:
26667
Long-form identifier:
mindat:1:1:26667:5
IMA Classification of Schlegelite
Approved
IMA Formula:
Bi3+7O4(Mo6+O4)2(As5+O4)3
Approval year:
2003
First published:
2006
Classification of Schlegelite
8.BO.45
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
O : With only large cations, (OH, etc.):RO4 about 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
O : With only large cations, (OH, etc.):RO4 about 1:1
43.3.3.1
43 : COMPOUND PHOSPHATES, ETC.
3 : Hydrated Normal Compound Phosphates, etc·
43 : COMPOUND PHOSPHATES, ETC.
3 : Hydrated Normal Compound Phosphates, etc·
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 for Standard |
|---|---|---|
| Scg | 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 Schlegelite
Adamantine
Transparency:
Transparent, Translucent
Colour:
Yellow
Streak:
Pale yellow
Hardness:
3½ on Mohs scale
Hardness:
VHN25=285(20) kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Distinct/Good
good parallel to {010} and {001}
good parallel to {010} and {001}
Fracture:
Irregular/Uneven
Density:
7.23 g/cm3 (Calculated)
Optical Data of Schlegelite
Type:
Biaxial (-)
RI values:
nα = 2.22 nβ = 2.225 nγ = 2.26
2V:
Measured: 40° , Calculated: 40°
Max. Birefringence:
δ = 0.040
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Pleochroism:
Non-pleochroic
Chemistry of Schlegelite
Mindat Formula:
Bi7(AsO4)3(MoO4)2O4
Element Weights:
Elements listed:
Crystallography of Schlegelite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 5.299(1) Å, b = 16.133(4) Å, c = 23.948(5) Å
Ratio:
a:b:c = 0.328 : 1 : 1.484
Unit Cell V:
2047.2 ų
Z:
4
Morphology:
Lath-like crystals, elongated parallel to [100], with {010} (dominant), {001} and {100}.
Comment:
Space Group: Pnca.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0007187 | Schlegelite | Krause W, Bernhardt N J, Effenberger H (2006) Schlegelite, Bi7O4(MoO4)2(AsO4)3, a new mineral from Schneeberg, Saxony, Germany European Journal of Mineralogy 18 803-811 | 2006 | Pucher Richtschacht, Schneeberg, Saxony, Germany | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.688 Å | (100) |
| 2.996 Å | (69) |
| 2.963 Å | (48) |
| 3.413 Å | (37) |
| 2.001 Å | (28) |
| 1.657 Å | (14) |
| 1.887 Å | (13) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Schlegelite
General Appearance of Type Material:
Dense spherical aggregates, composed of small lath-like crystals up to 0.3 mm in length
Place of Conservation of Type Material:
“Staatliches Museum für Mineralogie und Geologie“, Dresden, Germany, under catalogue number 19625Sa(MMG).
Associated Minerals at Type Locality:
Synonyms of Schlegelite
Other Language Names for Schlegelite
Dutch:Schlegeliet
German:Schlegelit
Common Associates
Associations Based on Photo Data:
| 1 photo of Schlegelite associated with Scorodite | Fe3+AsO4 · 2H2O |
| 1 photo of Schlegelite associated with Petitjeanite | Bi3(PO4)2O(OH) |
| 1 photo of Schlegelite associated with Sillénite | Bi12SiO20 |
| 1 photo of Schlegelite associated with Native Bismuth | Bi |
| 1 photo of Schlegelite associated with Quartz | SiO2 |
| 1 photo of Schlegelite associated with Pucherite | Bi(VO4) |
Related Minerals - Strunz-mindat Grouping
| 8.BO. | Ariegilatite | BaCa12(SiO4)4(PO4)2F2O |
| 8.BO. | Aravaite | Ba2Ca18(SiO4)6(PO4)3(CO3)F3O |
| 8.BO. | Theuerdankite | Ag3AsO4 |
| 8.BO.05 | Nacaphite | Na2Ca(PO4)F |
| 8.BO.10 | Petitjeanite | Bi3(PO4)2O(OH) |
| 8.BO.10 | Schumacherite | Bi3(VO4)2O(OH) |
| 8.BO.10 | Preisingerite | Bi3(AsO4)2O(OH) |
| 8.BO.15 | Hechtsbergite | Bi2(VO4)O(OH) |
| 8.BO.15 | Smrkovecite | Bi2(PO4)O(OH) |
| 8.BO.15 | Atelestite | Bi2(AsO4)O(OH) |
| 8.BO.20 | Sahlinite | Pb14(AsO4)2O9Cl4 |
| 8.BO.20 | Kombatite | Pb14(VO4)2O9Cl4 |
| 8.BO.25 | Heneuite | CaMg5(CO3)(PO4)3(OH) |
| 8.BO.30 | Nefedovite | Na5Ca4(PO4)4F |
| 8.BO.35 | Kuznetsovite | [Hg2]2+Hg2+[AsO4]Cl |
| 8.BO.40 | Artsmithite | [Hg2]2+2Al(PO4)1.74(OH)1.78 |
| 8.BO.50 | Hereroite | [Pb32(O,◻)21](AsO4)2[(Si,As,V,Mo)O4]2Cl10 |
| 8.BO.50 | Erikjonssonite | (Pb32O21)[(V,Si,Mo,As)O4]4Cl9 |
| 8.BO.55 | Rudabányaite | (Ag2Hg2)(AsO4)Cl |
| 8.BO.60 | Segerstromite | Ca3(As5+O4)2[As3+(OH)3]2 |
| 8.BO.65 | Wiklundite | Pb2(Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6 |
Other Information
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 Schlegelite
mindat.org URL:
https://www.mindat.org/min-26667.html
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Please feel free to link to this page.
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References for Schlegelite
Localities for Schlegelite
Showing 6 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
France | |
| Lesénéchal et al. (04/21) |
| Lesénéchal et al. (04/21) | |
Germany | |
| Baumann et al. (03/2021) |
| Bär et al. (2021) |
| Acta Cryst. (2004) +1 other reference |
Spain | |
| Rewitzer et al. (2018) |
Quick NavTopAbout SchlegeliteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Vaulry Mines, Vaulry, Bellac, Haute-Vienne, Nouvelle-Aquitaine, France