Karlite
A valid IMA mineral species
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About Karlite
Franz Karl
Formula:
(Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5
Simplified Mg7(BO3)3(OH,Cl)5.
Colour:
White to light green
Lustre:
Silky
Hardness:
5½
Specific Gravity:
2.80 - 2.85
Crystal System:
Orthorhombic
Name:
In honour of Dr. Franz Karl (8 July 1918, Bischofshofen/Salzburg, Austria – 15 August 1972, Kiel, Germany), Professor of Mineralogy and Petrography, Christian Albrechts University, Kiel, Germany, for his studies of the geology of the eastern Alps.
Type Locality:
This page provides mineralogical data about Karlite.
Unique Identifiers
Mindat ID:
2160
Long-form identifier:
mindat:1:1:2160:5
Similar Names
| Carrolite | A synonym of Carrollite | |
| Graulite | A synonym of 'Tecticite' | |
| Gurolite | A synonym of Gyrolite | |
| Jarlite | A valid IMA mineral species - grandfathered | Na(Sr,Na)7MgAl6F32(OH,H2O)2 |
| Karite | A variety of Diamond | C |
| Karlleuite | A valid IMA mineral species | Ca2MnO4 |
| Kerolite | (Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1) | |
| Kurilite | A valid IMA mineral species | Ag8Te3Se |
| Marlite | A synonym of 'Marlstone' |
IMA Classification of Karlite
Approved
Approval year:
1980
First published:
1981
Classification of Karlite
6.AB.25
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
10.1.6
10 : Borates with other anions
1 : Borates with halide
10 : Borates with other anions
1 : Borates with halide
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 |
|---|---|---|
| Ka | 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 Karlite
Silky
Transparency:
Translucent
Colour:
White to light green
Streak:
White
Hardness:
5½ on Mohs scale
Cleavage:
Perfect
(001)
(001)
Density:
2.80 - 2.85 g/cm3 (Measured) 2.85 g/cm3 (Calculated)
Comment:
Measured using the suspension method
Optical Data of Karlite
Type:
Biaxial (-)
RI values:
nα = 1.589 nβ = 1.632 nγ = 1.634
2V:
Measured: 22° to 25°, Calculated: 22°
Max. Birefringence:
δ = 0.045
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:
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.
Dispersion:
none
Chemistry of Karlite
Mindat Formula:
(Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5
Simplified Mg7(BO3)3(OH,Cl)5.
Simplified Mg7(BO3)3(OH,Cl)5.
Element Weights:
Crystallography of Karlite
Crystal System:
Orthorhombic
Class (H-M):
222 - Disphenoidal
Space Group:
P21212
Cell Parameters:
a = 17.965(1) Å, b = 17.631(1) Å, c = 3.1041(2) Å
Ratio:
a:b:c = 1.019 : 1 : 0.176
Unit Cell V:
983.20 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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CIF File Best | x | y | z | a | b | c
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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) |
|---|---|---|---|---|---|---|---|
| 0014800 | Karlite | Bonazzi P, Menchetti S, Sabelli C, Trosti-Ferroni R (1986) Karlite: crystal structure and chemical composition Neues Jahrbuch fur Mineralogie, Monatshefte 1986 253-262 | 1986 | Tauern Window, Schleigeistal, Zillertaler, Alpen, Austria | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.829 Å | (100) |
| 2.2522 Å | (94) |
| 12.53 Å | (83) |
| 3.947 Å | (72) |
| 2.6211 Å | (72) |
| 6.27 Å | (67) |
| 1.1907 Å | (67) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Karlite
General Appearance of Type Material:
Aggregates of minute needles and prisms elongated parallel to c, up to 10 mm long. Sometimes in rosette-like forms. At a first glance it resembles tremolite-actinolite.
Place of Conservation of Type Material:
Mineralogisches Institut und Museum der Universitat Kiel, Olshausenstr. 40-60, D 2300 Kiel, Germany and at the Institut fiir Mineralogie und Kristallographie, Technische Universitat Berlin, StraBe des 17. Juni 135, D 1000 Berlin 12, Germany.
Geological Setting of Type Material:
Clinohumite-chlorite marble
Associated Minerals at Type Locality:
Synonyms of Karlite
Other Language Names for Karlite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 6.AB. | Chubarovite | KZn2(BO3)Cl2 |
| 6.AB. | Rhabdoborite-(Mo) | Mg12Mo6+1.33O6(BO3)6F2 |
| 6.AB.05 | Hambergite | Be2(BO3)(OH) |
| 6.AB.10 | Berborite | Be2(BO3)(OH) · H2O |
| 6.AB.15 | Jeremejevite | Al6(BO3)5(F,OH)3 |
| 6.AB.20 | Yuanfuliite | Mg(Fe3+,Al)O(BO3) |
| 6.AB.20 | Warwickite | (Mg,Ti,Fe,Al)2O(BO3) |
| 6.AB.30 | Marinaite | Cu2Fe3+O2(BO3) |
| 6.AB.30 | Savelievaite | Mg2Cr3+O2(BO3) |
| 6.AB.30 | Fredrikssonite | Mg2Mn3+O2(BO3) |
| 6.AB.30 | Vonsenite | Fe2+2Fe3+(BO3)O2 |
| 6.AB.30 | Ludwigite | Mg2Fe3+(BO3)O2 |
| 6.AB.30 | Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 |
| 6.AB.30 | Bonaccordite | Ni2Fe3+(BO3)O2 |
| 6.AB.35 | Folvikite | Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 |
| 6.AB.35 | Pinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
| 6.AB.40 | Takéuchiite | (Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2 |
| 6.AB.40 | Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 |
| 6.AB.40 | Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
| 6.AB.40 | Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 |
| 6.AB.45 | Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 |
| 6.AB.45 | Hulsite | Fe2+2Fe3+O2(BO3) |
| 6.AB.45 | Magnesiohulsite | Mg2Fe3+O2(BO3) |
| 6.AB.50 | Fluoborite | Mg3(BO3)(F,OH)3 |
| 6.AB.50 | Hydroxylborite | Mg3(BO3)(OH)3 |
| 6.AB.55 | Shabynite | Mg5(BO3)(OH)5(Cl,OH)2 · 4H2O |
| 6.AB.55 | Wightmanite | Mg5(BO3)O(OH)5 · 2H2O |
| 6.AB.60 | Gaudefroyite | Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3 |
| 6.AB.65 | Sakhaite | Ca48Mg16(BO3)32(CO3)16 · 2(H2O,HCl) |
| 6.AB.70 | Harkerite | Ca48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl) |
| 6.AB.75 | Pertsevite-(F) | Mg2(BO3)(F,OH) |
| 6.AB.75 | Pertsevite-(OH) | Mg2(BO3)(OH) |
| 6.AB.80 | Jacquesdietrichite | Cu2(H2BO3)(OH)3 |
| 6.AB.85 | Rhabdoborite-(V) | Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1) |
| 6.AB.85 | Rhabdoborite-(W) | Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} |
| 6.AB.85 | Painite | CaZrAl9(BO3)O15 |
| 6.AB.90 | Mengxianminite | (Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2 |
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 Karlite
mindat.org URL:
https://www.mindat.org/min-2160.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Karlite
Localities for Karlite
Showing 3 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.
Austria (TL) | |
| Franz et al. (1981) |
France | |
| Dubru. M (1986) |
Russia | |
| maurice.strahlen.org (2004) |
Quick NavTopAbout KarliteUnique IdentifiersSimilar NamesIMA 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
Furtschaglkar, Finkenberg, Schwaz District, Tyrol, Austria