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Kato T , Ito Y , Hashimoto N , Neues Jahrbuch fur Mineralogie, Monatshefte , 1989 (1989) p.410-430, The crystal structures of sonolite and jerrygibbsite, Locality: Hokkejino mine, Kyoto Prefecture, Honshu, Japan
Physical Properties of Sonolite
Cleavage:
{???} Indistinct
Color:
Dark brown, Dark reddish brown, Pink brown, Reddish orange.
Density:
3.82
Diaphaneity:
Transparent to Translucent
Hardness:
5.5 - Knife Blade
Luster:
Vitreous (Glassy)
Optical Properties of Sonolite
Gladstone-Dale:
CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1908,KPDmeas= 0.2033,KC= 0.2014 Ncalc = 1.77 - 1.82