Bytownite

In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). You can find the explanation on the plagioclase feldspar page.

Physical Properties
Chemical formula (Ca,Na)(Si,Al)4O8
Class Tectosilicate
3D framework of linked tetrahedra
Crystal system Triclinic
Habit Tabular
Massive
Granular
Frequently twinned
from minerals.net
Color Colorless
Grey
White
Hardness 7
Specific gravity 2.71
Cleavage Perfect {001}, good {010}
Fracture Uneven
Luster Vitreous
Transparency Translucent to transparent
Streak White
Optical Properties
PPL Colorless
Non-pleochroic
XPL 1st order grey
δ 0.010
after webmineral.com

Bytownite in Hand Sample

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Bytownite in Thin Section

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Further Reading

Bytownite at mindat.org

Bytownite at webmineral.com