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Formula: (Ba,Pb,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28F
Cyclosilicate (ring silicate), hyalotekite group,
yttrium-bearing mineral
Crystal System: Triclinic
Specific gravity: 3.81 to 3.82 measured 3.953 calculated
Hardness: 5½
Streak: White
Colour: White to pearly grey
Common impurities: Fe,Mn,Cu,Mg,Sr,Na,Rb
Environments:
Pegmatites
Metamorphic environments
Localities
At the type locality, the Långban mine, Långban Ore District, Filipstad, Värmland County, Sweden, hyalotekite occurs in
high temperature manganese skarn. Associated minerals include
quartz, calcite,
hematite, barylite,
baryte, manganese-bearing pectolite,
iron-bearing K-feldspar, andradite,
melanotekite, barium-bearing hedyphane,
lead-bearing taramellite, rhodonite
and manganese-bearing aegirine
(HOM, Mindat).
At the Dara-i-Pioz Glacier, Districts of Republican Subordination, Tajikistan, hyalotekite occurs in
reedmergnerite pegmatite
in an alkaline massif, associated with feldspar,
reedmergnerite, aegirine,
pyrochlore, eudialyte and
polylithionite
(HOM).
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