Cerargyrite (Chlorargyrite), AgCl, Cubic, Fm3m
< Specimen No. III-l >
Specimen No. III-l, from the Takatama Mine, Fukushima Pref., occurs as deep brown thin incrustations in fractures of an adularia-bearing quartz vein in an epithermal gold-silver deposit.
Fluorite, CaF2, Cubic, Fm3m
< Specimens No. III-2—No. III-24 > (Fig. 50)
Specimen No. III-2, from the Hosokura Mine, Miyagi Pref., occurs in
alternate banding with deep brown sphalerite in an epithermal quartz vein
(Fig. 51).
Specimen No. III-3, from the Ebisu Mine, Gifu Pref., forms aggregates of cubic crystals showing light green colour, and occurs in association with sericite in cavities of a quartz vein in a preumotolytic wolframite-cassiterite deposit.
Specimens Nos. III-4 & III-5, from the Omodani Mine, Fukui Pref., occur on crystalline quartz in cavities of a quartz vein in an epithermal copper-zinc deposit, form cube-shaped crystals with a(100) and o(111), and are green and transparent. Black sphalerite crystals grow on the surface of the fluorite crystals.
Specimens No. III-6—No. III-13, from the Kanagase Deposit of the Ikuno
Mine, Hyogo Pref., occur in drusy parts of a quartz vein in a xenothermal
polymetallic deposit, and form light green, transparent and cube-shaped crystals
with a(100) and o(111), attaining 4 cm on the edge. Associated minerals are
pyrite and calcite (Fig. 52).
Specimens Nos. III-14 & III-15, from the Akenobe Mine, Hyogo Pref., occur in drusy cavities in a quartz vein of a xenothermal polymetallic deposit. The crystals are cubic in form, colourless to greenish grey and transparent.
Specimens No. III-16—No. III-18, from the Obira Mine, Oita Pref., occur in drusy cavities in quartz as product of pneumatolytic metasomatism, and are transparent octahedral crystals surrounded by the (111) cleavage faces artificially produced.
Specimens Nos. III-19 & III-20, from the Keumwha Mine, Korea, are aggre-gates of cube-shaped crystals with a(100), and occur in drusy cavities of a fluorite-calcite-quartz vein.
Specimens No. III-21—No. III-23, from the Haseong Mine, Korea, occur as massive aggregates of minute-grained fluorite and fine-grained quartz, almost uniformly mixed but somehow showing a banded texture in colour alternation, from pale purple to yellowish brown. This fluorite deposit fills fractures of a Precambrian slate.
Specimen No. III-24, from Rimbu, China, is aggregates of transparent cubic crystals attaining a few centimeters along the edge, and shows pale blue colour with greenish tint. It is associated with small quartz crystals.
Zavaritskite, BiOF, Tetragonal, P4/nmm
< Specimen No. III-25 > (Fig. 53)
Specimen No. III-25 is from the Ebisu Mine, Gifu Pref. See bismuth (No. 1-72).