Karlite
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About Karlite
Formula:
Mg7(BO3)3(OH,Cl)5
Hardness:
5½
Crystal System:
Orthorhombic
Name:
In honour of Dr. Franz Karl (1918–1972), Professor of Mineralogy and Petrography, Christian Albrechts University, Kiel, Germany, for his studies of the geology of the eastern Alps.
This page provides mineralogical data about Karlite.
Classification of Karlite
Approved
Approval Year:
1980
5/G.05-20
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
Physical Properties of Karlite
Hardness:
5½ on Mohs scale
Optical Data of Karlite
Type:
Biaxial (-)
RI values:
nα = 1.589 nβ = 1.632 nγ = 1.634
2V:
Measured: 24° , Calculated: 22°
Max Birefringence:
δ = 0.045

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
Chemical Properties of Karlite
Formula:
Mg7(BO3)3(OH,Cl)5
IMA Formula:
(Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5
Crystallography of Karlite
Crystal System:
Orthorhombic
Cell Parameters:
a = 17.92 Å, b = 17.6 Å, c = 3.1 Å
Ratio:
a:b:c = 1.018 : 1 : 0.176
Unit Cell V:
977.72 ų (Calculated from Unit Cell)
Type Occurrence of Karlite
Synonyms of Karlite
Other Language Names for Karlite
Related Minerals - Nickel-Strunz Grouping
6.AB.05 | Hambergite | Be2(BO3)(OH) | Orth. mmm (2/m 2/m 2/m) : Pbca |
6.AB.10 | Berborite | Be2(BO3)(OH,F) · H2O | Trig. |
6.AB.15 | Jeremejevite | Al6(BO3)5(F,OH)3 | Hex. 6/m : P63/m |
6.AB.20 | Warwickite | (Mg,Ti,Fe,Cr,Al)2O(BO3) | Orth. |
6.AB.20 | Yuanfuliite | Mg(Fe3+,Al)O(BO3) | Orth. |
6.AB.30 | Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 | Orth. |
6.AB.30 | Bonaccordite | Ni2Fe3+(BO3)O2 | Orth. |
6.AB.30 | Fredrikssonite | Mg2(Mn3+,Fe3+)(BO3)O2 | Orth. |
6.AB.30 | Ludwigite | Mg2Fe3+(BO3)O2 | Orth. |
6.AB.30 | Vonsenite | Fe2+2Fe3+(BO3)O2 | Orth. |
6.AB.35 | Pinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 | Mon. |
6.AB.40 | Blatterite | Sb5+(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 | Orth. mmm (2/m 2/m 2/m) : Pnnm |
6.AB.40 | Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 | Orth. |
6.AB.40 | Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 | Orth. |
6.AB.40 | Takéuchiite | (Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2 | Orth. |
6.AB.45 | Hulsite | (Fe2+,Mg)2(Fe3+,Sn)(BO3)O2 | Mon. |
6.AB.45 | Magnesiohulsite | (Mg,Fe2+)2(Fe3+,Sn,Mg)(BO3)O2 | Mon. |
6.AB.45 | Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 | Mon. 2/m |
6.AB.50 | Fluoborite | Mg3(BO3)(F,OH)3 | Hex. |
6.AB.50 | Hydroxylborite | Mg3(BO3)(OH)3 | Hex. 6/m : P63/m |
6.AB.55 | Shabynite | Mg5(BO3)(OH)5(Cl,OH)2 · 4H2O | Mon. |
6.AB.55 | Wightmanite | Mg5(BO3)O(OH)5 · 2H2O | Mon. |
6.AB.60 | Gaudefroyite | Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3 | Hex. |
6.AB.65 | Sakhaite | Ca12Mg4(BO3)7(CO3)4(OH)2Cl | Iso. m3m (4/m 3 2/m) : Fd3m |
6.AB.70 | Harkerite | Ca12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2O | Trig. 3m (3 2/m) : R3m |
6.AB.75 | Pertsevite-(F) | Mg2(BO3)(F,OH) | Orth. mm2 : Pna21 |
6.AB.75 | Pertsevite-(OH) | Mg2(BO3)(OH) | Orth. mmm (2/m 2/m 2/m) : Pnma |
6.AB.80 | Jacquesdietrichite | Cu2(H2BO3)(OH)3 | Orth. mmm (2/m 2/m 2/m) : Pmna |
6.AB.85 | Painite | CaZrAl9(BO3)O15 | Hex. |
Related Minerals - Hey's Chemical Index of Minerals Grouping
10.1.1 | Teepleite | Na2[B(OH)4]Cl | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
10.1.2 | Bandylite | Cu[B(OH)4]Cl | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
10.1.3 | Berborite | Be2(BO3)(OH,F) · H2O | Trig. |
10.1.4 | Fluoborite | Mg3(BO3)(F,OH)3 | Hex. |
10.1.5 | Boracite | Mg3(B7O13)Cl | Orth. mm2 : Pca21 |
10.1.7 | Shabynite | Mg5(BO3)(OH)5(Cl,OH)2 · 4H2O | Mon. |
10.1.8/9/10 | Hilgardite | Ca2B5O9Cl · H2O | Tric. 1 : P1 |
10.1.11 | Solongoite | Ca2(H3B3O7)(OH)Cl | Mon. |
10.1.12 | Hydrochlorborite | Ca4B8O15Cl2 · 21H2O | Mon. |
10.1.13 | Ekaterinite | Ca2(B4O7)(Cl,OH)2 · 2H2O | Hex. |
10.1.14 | Volkovskite | KCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O | Tric. 1 : P1 |
10.1.15 | Chelkarite | CaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1 | Orth. |
10.1.16 | Johachidolite | CaAlB3O7 | Orth. mmm (2/m 2/m 2/m) : Cmma |
10.1.17 | Satimolite | KNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4·4H2O | Trig. 3m (3 2/m) : R3m |
10.1.18 | Chambersite | Mn2+3(B7O13)Cl | Orth. mm2 : Pca21 |
10.1.19 | Congolite | (Fe2+,Mg)3(B7O13)Cl | Trig. 3m : R3c |
10.1.20 | Ericaite | Fe2+3(B7O13)Cl | Orth. |
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.
References for Karlite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1981): 66: 872-877.
Neues Jahrbuch für Mineralogie, Monatshefte (1986): 253-262.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Internet Links for Karlite
mindat.org URL:
https://www.mindat.org/min-2160.html
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Localities for Karlite
Locality List




All localities listed without proper references should be considered as questionable.
Austria (TL) | |
| G. Franz, D. Ackermann, E. Koch: Amer. Mineral. 66:872-877 (1981) |
France | |
| Dubru. M, (1986) Pétrologie et géochimie du marbre à brucite et des borates associés au gisement de tungstène de Costabonne, (Pyrénées orientales, France) 930p |
Russia | |
| http://maurice.strahlen.org/yakutia/yakutia.htm |
Furtschaglkar, Schlegeis valley, Zillertal, North Tyrol, Tyrol, Austria