Fibrous, of a pale pea-green colour, without the pearly lustre of satin-spar; from Arhendale mines.
Forming stalactites and stalagmites in all the mines: coating detached crystals of fluor from Allenheads.
Large quantities of calcareous spar in a state of disintegration, the fragments resembling bay-salt in size and colour may be observed on the top of Cronkley Fell.
Carbonate of Lime. Arragonite.—Flos-ferri. Beautiful specimens of this rare mineral of a snow-white colour and satin-like lustre have been found in Dufton mines.
Fluate of Lime.—Earthy, from Breckensyke mine, where the galena is also found partially decomposed.
In white, topaz and wine yellow, bluish emerald green, and most commonly in violet or purple crystals, having the form of the cube, the cube with its angles truncated, with its angles acuminated by 3 planes set on the lateral planes; also in tabular and in 24-sided crystals. From Aldstone, Allenheads, &c.
In small purple cubic crystals, bevelled on the edges, attached to sandstone; from a mine near New house in Weardale.
In cubic crystals of a bright emerald green colour, containing drops of water; from the Weardale mines.
In a state of decomposition, coated by crystallized quartz purple or blackish in colour, and sometimes appearing as if it had been in a state of fusion; from Coal cleugh and Aldstone mines.
Sulphate of Lime. Selenite.—In 6-sided prismatic crystals terminated by convex planes (Jameson, vol. i. p. 568) on pearl-spar in a state of disintegration; from Aldstone mines.
