Szklaryite
{{Infobox mineral
| name = Szklaryite
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| category = Arsenate
| formula = []Al6BAs33+O15
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| system = Orthorhombic
| class = Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
| symmetry = Pbcm
| unit cell = a = 47.00 Å, b = 11.83 Å
c = 20.24 Å (approximated)
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| habit = tiny patch
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Szklaryite is an extremely rare mineral with the formula []Al6BAs33+O15.{{cite journal|doi=10.1180/minmag.2013.077.6.10 |title=The dumortierite supergroup. II. Three new minerals from the Szklary pegmatite, SW Poland: Nioboholtite, (Nb0.6〈0.4)Al6BSi3O18, titanoholtite, (Ti0.75〈0.25)Al6BSi3O18, and szklaryite, 〈Al6BAs3+3O15 |journal=Mineralogical Magazine |volume=77 |issue=6 |pages=2841 |year=2013 |last1=Pieczka |first1=A. |last2=Evans |first2=R. J. |last3=Grew |first3=E. S. |last4=Groat |first4=L. A. |last5=Ma |first5=C. |last6=Rossman |first6=G. R. |bibcode=2013MinM...77.2841P |s2cid=51740732 |url=https://authors.library.caltech.edu/41877/1/s10.pdf |url-access= |url-status= |archive-url= |archive-date= }} It is essentially vacant ("[]"), arsenic-dominant member of dumortierite supergroup, giving a name of szklaryite group. It is one of three quite recently found minerals of this group, the other two being nioboholtite and titanoholtite, all coming from the Szklary village near Ząbkowice Śląskie in Poland.{{cite web|url=http://www.mindat.org/min-43590.html |title=Szklaryite: Szklaryite mineral information and data |website=Mindat.org |accessdate=2016-03-03}} They occur in a unique pegmatite of probable anatectic origin.Pieczka, A., 2000. A rare mineral-bearing pegmatite from the Szklary serpentinite massif, the Fore-Sudetic Block, SW Poland. Geologia Sudetica 33, 23-31
Occurrence and association
Szklaryite was detected as a tiny patch ca. 2 μm in size, in arsenic- and antimony-bearing dumortierite. Such a small size precluded determination of many of its properties. Szklaryite is associated with a wide variety of minerals including: nioboholtite, titanoholtite, fersmite, holtite, alluaudite, native antimony, manganese-bearing minerals of the apatite group (F-, OH- and Cl-rich apatite), native arsenic, beusite, native bismuth, cheralite, chrysoberyl, columbite-(Fe), columbite-(Mn), ernienickelite, native gold, gorceixite, hollandite, microcline, mitridatite, monazite-(Ce), muscovite, natrophilite, nontronite, various representatives of the betafite, microlite and pyrochlore groups; paradocrasite, phosphohedyphane, plumbogummite, pollucite, purpurite, quartz, ranciéite, romanèchite, saponite, spessartine, stibarsen, stibiocolumbite, stibiotantalite, tantalite-(Mn), thorutite, uraninite, xenotime-(Y), and zircon.