Oxy-schorl
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About Oxy-schorl
Formula:
Na(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3O
Colour:
Greenish black;brownish black
Hardness:
7
Specific Gravity:
3.17 - 3.19
Crystal System:
Trigonal
Member of:
Name:
For being an "oxidised" "schorl".
"Schorl" with O>OH,F on the W site; not uncommon, but can be reliably identified only from detailed and quantitative chemical analyses.
Originally used as a working name and published without approval, then finally approved in 2011.
Compare also oxy-dravite.
Originally used as a working name and published without approval, then finally approved in 2011.
Compare also oxy-dravite.
Classification of Oxy-schorl
Approved
Approval Year:
2011
8/E.19-X
9.CK.05
9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
Physical Properties of Oxy-schorl
Colour:
Greenish black;brownish black
Hardness:
7 on Mohs scale
Cleavage:
None Observed
Parting:
None observed
Density:
3.17 - 3.19 g/cm3 (Measured) 3.208 g/cm3 (Calculated)
Comment:
3.17 g/cm3 (Zlatá Idka) and 3.19 g/cm3 (Přibyslavice)
Optical Data of Oxy-schorl
Type:
Uniaxial (-)
RI values:
nω = 1.662 - 1.663 nε = 1.637 - 1.641
Max Birefringence:
δ = 0.025

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
Pleochroism:
Visible
Comments:
In plane-polarized light: O = green to bluish-green, E = pale yellowish to nearly colorless (Zlatá Idka) and O = dark grayish-green, E = pale brown (Přibyslavice)
Chemical Properties of Oxy-schorl
Formula:
Na(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3O
Crystallography of Oxy-schorl
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 15.916(3) Å, c = 7.107(1) Å
Ratio:
a:c = 1 : 0.447
Unit Cell V:
1559.1 ų
Morphology:
Acicular crystals forming fan-shaped aggregates; subhedral, columnar Crystals arranged in thin layers or irregular clusters.
Comment:
Data given for Zlatá Idka sample. For Přibyslavice: a = 15.985(1) Å, c = 7.154(1) Å, V = 1583.1(2) Å3 .
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
6.364 | (74) |
4.978 | (28) |
4.225 | (48) |
4.000 | (52) |
3.466 | (100) |
2.955 | (79) |
2.583 | (65) |
2.042 | (31) |
Type Occurrence of Oxy-schorl
Co-Type Localities:
General Appearance of Type Material:
Fan-shaped aggregates of greenish black acicular crystals ranging up to 2 cm in size, forming aggregates up to 3.5 cm (Zlatá Idka)
Place of Conservation of Type Material:
Type material is deposited in the collections of the Department of Mineralogy and Petrography, Moravian Museum, Brno, Czech Republic, specimen numbers B10521 and B10522, the East-Slovak Museum, Natural History Division, Košice, Slovakia, specimen number G
Geological Setting of Type Material:
Metasomatically altered metarhyolite pyroclastics (Zlatá Idka):
Foliated muscovite-tourmaline orthogneiss (Přibyslavice)
Synonyms of Oxy-schorl
Other Language Names for Oxy-schorl
Spanish:Oxichorlo
Relationship of Oxy-schorl to other Species
Member of:
Other Members of this group:
Adachiite | CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Bosiite | NaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Chromium-dravite | Na(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH) | Trig. |
Chromo-alumino-povondraite | Na(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Darrellhenryite | Na(LiAl2)Al6(BO3)3Si6O18(OH)3O | Trig. 3m : R3m |
Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Feruvite | Ca(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Fluor-buergerite | Na(Fe3+3)Al6(Si6O18)(BO3)3O3F | Trig. 3m : R3m |
Fluor-dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Fluor-elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Fluor-feruvite | Ca(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3F | |
Fluor-liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Fluor-schorl | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Fluor-tsilaisite | Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Fluor-uvite | Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Foitite | (□,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OH | Trig. 3m : R3m |
Liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Lucchesiite | CaFe2+3 Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Luinaite-(OH) | Na(Fe2+)3Al6(Si6O18)(BO3)3(OH)3(OH) | Mon. m : Bm |
Magnesio-foitite | (□,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. |
Maruyamaite | K(MgAl2)(Al5Mg)(BO3)3(Si6O18)(OH)3O | Trig. 3m : R3m |
Olenite | Na(Al3)Al6(Si6O18)(BO3)3O3(OH) | Trig. |
Oxy-chromium-dravite | Na(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Oxy-dravite | Na(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Oxy-foitite | □(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m (3 2/m) : R3m |
Oxy-rossmanite | ☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O | |
Oxy-uvite | CaMg3Al6(Si6O18)(BO3)3(OH)3O | |
Oxy-vanadium-dravite | Na(V)3(V4Mg2)Si6O18(BO3)3(OH)3O | Trig. 3m : R3m |
Povondraite | NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O | Trig. |
Rossmanite | ☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Schorl | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Tsilaisite | Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
UM2000-64-SiO:BFeHKMg | K, Mg, Fe, Si, B, O, H | |
Unnamed (Pb-dominant Tourmaline) | (Pb,Na)(Li,Al)3Al6(Si6O18)(BO3)3(OH)3(F,OH) | |
Uvite Series | Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH) | Trig. 3m : R3m |
Vanadio-oxy-chromium-dravite | Na(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Vanadio-oxy-dravite | NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m |
Related Minerals - Nickel-Strunz Grouping
9.CK. | Fluor-schorl | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK. | Darrellhenryite | Na(LiAl2)Al6(BO3)3Si6O18(OH)3O | Trig. 3m : R3m |
9.CK. | Adachiite | CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Fluor-buergerite | Na(Fe3+3)Al6(Si6O18)(BO3)3O3F | Trig. 3m : R3m |
9.CK.05 | Chromium-dravite | Na(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH) | Trig. |
9.CK.05 | Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Feruvite | Ca(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Foitite | (□,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OH | Trig. 3m : R3m |
9.CK.05 | Liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Olenite | Na(Al3)Al6(Si6O18)(BO3)3O3(OH) | Trig. |
9.CK.05 | Povondraite | NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O | Trig. |
9.CK.05 | Schorl | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Magnesio-foitite | (□,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. |
9.CK.05 | Rossmanite | ☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Tsilaisite | Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Oxy-vanadium-dravite | Na(V)3(V4Mg2)Si6O18(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Oxy-dravite | Na(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Oxy-rossmanite | ☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O | |
9.CK.05 | Luinaite-(OH) | Na(Fe2+)3Al6(Si6O18)(BO3)3(OH)3(OH) | Mon. m : Bm |
9.CK.05 | Fluor-elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Chromo-alumino-povondraite | Na(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Fluor-dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Fluor-liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Oxy-chromium-dravite | Na(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Fluor-tsilaisite | Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Vanadio-oxy-chromium-dravite | Na(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Uvite (OH-dominant end-member) | Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Fluor-uvite | Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Vanadio-oxy-dravite | NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m |
9.CK.10 | Abenakiite-(Ce) | Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)O | Trig. 3 : R3 |
9.CK.15 | Scawtite | Ca7(Si3O9)2CO3 · 2H2O | Mon. 2/m |
9.CK.20 | Steenstrupine-(Ce) | Na14Mn2+2(Fe3+,Mn3+)2Ce6(Zr,Th)(Si6O18)2(PO4)6(HPO4)(OH)2 · 2H2O | Trig. |
9.CK.20 | Thorosteenstrupine | (Ca,Th,Mn)3Si4O11F · 6H2O |
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 Oxy-schorl
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Novák, M., Povondra, P. & Selway, Julie B. (2004): Schorl-oxy-schorl to dravite-oxy-dravite tourmaline from granitic pegmatites; examples from the Moldanubicum, Czech Republic. European Journal of Mineralogy 16, 323-333.
Bačík, P., Cempírek, J., Uher, P., Ozdín, D., Filip, J., Novák, M., Škoda, R., Breiter, K., Klementová, M. and Ďud’a, R. (2011) Oxy-schorl, IMA 2011-011. CNMNC Newsletter No. 10, October 2011, page 2550; Mineral. Mag. 75, 2549-2561.
Bačík, P., Cempírek, J., Uher, P., Ozdín D., Filip, J., Novák, M., Škoda, R., Breiter, K., Klementová, M., Ďud’a, R. (2013): Oxy-schorl, Na(Fe2+2Al)Al6+Si6+O18(BO3)3(OH)3O, a new mineral from Zlatá Idka, Slovak Republic and Přibyslavice, Czech Republic. American Mineralogist, 98, 485-492.
Internet Links for Oxy-schorl
mindat.org URL:
https://www.mindat.org/min-40465.html
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Localities for Oxy-schorl
Locality List




All localities listed without proper references should be considered as questionable.
Canada | |
| Adlakha, E.E. & Hattori, K. (2016): Paragenesis and composition of tourmaline types along the P2 fault and Mcarthur River uranium deposit, Athabasca Basin, Canada. Canadian Mineralogist, 54, 661-679. |
Czech Republic (TL) | |
| Bačík, P., Cempírek, J., Uher, P., Ozdín, D., Filip, J., Novák, M., Škoda, R., Breiter, K., Klementová, M. and Ďud’a, R. (2011) Oxy-schorl, IMA 2011-011. CNMNC Newsletter No. 10, October 2011, page 2550; Mineralogical Magazine 75, 2549-2561; Bačík, P., Cempírek, J., Uher, P., Ozdín D., Filip, J., Novák, M., Škoda, R., Breiter, K., Klementová, M., Ďud’a, R. (2013): Oxy-schorl, Na(Fe2+2Al)Al6+Si6+O18(BO3)3(OH)3O, a new mineral from Zlatá Idka, Slovak Republic and Přibyslavice, Czech Republic. American Mineralogist, 98, 485-492. |
| Burianek, D. & Novak, M. (2004): Morphological and compositional evolution of tourmaline from nodular granite at Lavičky near Velké Meziříčí, Moldanubicum, Czech Republic. Journal of the Czech Geological Society 49, 81-90. |
Germany | |
| Ertl, A., Marschall, H.R., Giester, G., Henry, D.J., Schertl, H.-P., Ntaflos, T., Luvizotto, G.L., Nasdala, L. & Tillmanns, E. (2010): Metamorphic ultra high-pressure tourmalines: Structure, chemistry, and correlations to PT conditions. Am. Mineral., 95, 1-10. |
Italy | |
| Bosi, F., Naitza, S., Skogby, H., Secchi, F., Conte, A.M., Cuccuru, S., Hålenius, U., De La Rosa, N., Kristiansson, P., Nilsson, E.J.C., Ros, L., and Andreozzi, G.B. (2018) Late magmatic controls on the origin of schorlitic and foititic tourmalines from late-Variscan peraluminous granites of the Arbus pluton (SW Sardinia, Italy): crystal-chemical study and petrological constraints. Lithos, vol. 308-309, 395-411. |
Russia | |
| Volkov, A. V., Prokof’ev, V. Y., Alekseev, V. Y., Baksheev, I. A., & Sidorov, A. A. (2011, November). Ore-forming fluids and conditions of formation of gold-sulfide-quartz mineralization in the shear zone: Pogromnoe deposit (Eastern Transbaikalian region). In Doklady Earth Sciences (Vol. 441, No. 1, pp. 1492-1497). MAIK Nauka/Interperiodica. |
Slovakia (TL) | |
| Bačík P., Cempírek J., Uher P., Ozdín D., Filip J., Novák M., Škoda R., Breiter K., Klementová M., Ďud’a R. (2011): Oxy-schorl, IMA 2011-011. CNMNC Newsletter No. 10, Mineralogical Magazine 75, 5, 2549-2561.; Bačík, P., Cempírek, J., Uher, P., Ozdín D., Filip, J., Novák, M., Škoda, R., Breiter, K., Klementová, M., Ďud’a, R. (2013): Oxy-schorl, Na(Fe2+2Al)Al6+Si6+O18(BO3)3(OH)3O, a new mineral from Zlatá Idka, Slovak Republic and Přibyslavice, Czech Republic. American Mineralogist, 98, 485-492. |
USA | |
| Ertl, A., Rossman, G.R., Hughes, J.M., London, D., Wang, Y., O’Leary, J.A., Dyar, M.D., Prowatke, S., Ludwig, T. & Tillmanns, E. (2010): Tourmaline of the elbaite-schorl series from the Himalaya Mine, Mesa Grande, California, U.S.A.: A detailed investigation. Am. Mineral., 95, 24-40. |
| Roda-Robles, E., Simmons, W., Pesquera, A., Gil-Crespo, P. P., Nizamoff, J., & Torres-Ruiz, J. (2015). Tourmaline as a petrogenetic monitor of the origin and evolution of the Berry-Havey pegmatite (Maine, USA). American Mineralogist, 100(1), 95-109. |
Přibyslavice, Kutná Hora, Central Bohemian Region, Czech Republic