The Pallaflat mines (including the Southam pit and the Syke House pit) are famous for superb specimens of calcite in a variety of habits and combinations of rhombohedrons and
scalenohedrons. The so-called "butterfly twins" are particularly well known.
(4) Continuing formation of quartz, (II) so as to enclose some goethite sprays; during this interval sparse microscopic quartz (II) also grew upon the calcite
scalenohedron {21[bar.3]1}.
The foundation on which Hauy built his crystallography was the calcite
scalenohedron, a form studied and named by Bergman as the dent de cochon ("pig's tooth") form.
The transparent, medium-lustrous, Japan-law twins reach 12 cm across the wingtips; they are purplish towards their terminations, grading to colorless further down, and they have partial coatings of tiny, spiky, white calcite
scalenohedrons. Richly purple, "normal" prismatic crystals of amethyst accompany the Japan-law twins in some of these beautiful cabinet-size pieces.
A discovery at Casapalca in 2001 produced a few specimens with druses of small, sharp, gray
scalenohedrons to about 3 mm, with a few gypsum crystals to 5 cm resting on the druses.
Multiple generations of quartz (fine-grained, doubly terminated crystals, to large, transparent or milky crystals, to late amethystine scepters) and calcite (rhombohedrons,
scalenohedrons, platy and hexagonal prisms) are common in most cavities.
The original calcite crystals, individually reaching 5 cm, were
scalenohedrons with blunt trigonal terminations; the very sharp forms of these crystals are now memorialized by thin, silky yellow-brown to dark brown, hollow molds.
Calcite is encountered very frequently in the Fengjiashan mine, a first generation occurring as squat rhombohedrons and a second generation as steep
scalenohedrons. For the most part the crystals are opaque and colorless, and only rarely are they transparent and yellow.
In January 2006 the Mohodari quarry near Nasik produced a handful of spectacular large-cabinet calcite specimens, with lustrous, translucent yellow-brown rhombohedrons and modified
scalenohedrons, reaching 15 cm individually, resting lightly on basaltic matrix.
At the circle's center is a vertical aggregate of terraced
scalenohedrons ending in a spearpoint.
Calcite is uncommon in veins, occurring as colorless to white, rarely yellow,
scalenohedrons formed in the middle stage of mineralization.
This quarry is best known for its outstanding datolite and (rarely) babingtonite specimens, but these new white, translucent
scalenohedrons and compound
scalenohedrons of calcite, reaching 10 cm, are no poor sisters either.