Edgarbaileyite

Formula:   Hg₆Si₂O₇

Origin of name:   For Edgar Bailey, American geologist

Crystal system:   Monoclinic

Crystal class:   2/m

Twinning: Polysynthetic

Unit cell: a = 11.725, b = 7.698, c = 5.967, β = 112.07°

Colour:  Yellow, green, dark greenish brown, olive green

Diaphaneity:  Translucent, masses opaque

Luster:   Vitreous, resinous

Habit:   Thin crusts on fracture surfaces, round to mammillary masses and cryptocrystalline aggregates and 200 µm platy crystals in aggregates

Hardness:   4

Specific gravity:   9.4

Cleavage:   1; {100}

Tenacity: 

Streak:   Pale green with yellowish tint

Synonyms/varieties:

Comments:   Photosensitive-darkens to dark olive green; soluble in dilute HCl