The colour varies from yellowish or reddish to blackish-brown, and by transmitted light it is often blood-red; the streak is brownish-yellow; hardness, 5; specific gravity, 4.3.
The best crystals are the brilliant, blackish-brown prisms with terminal pyramidal planes (fig.) from the Restormel iron mines at Lostwithiel, and the Botallack mine at St Just in Cornwall.
HADDOCK (Gadus aeglefinus), a fish which differs from the cod in having the mental barbel very short, the first anal fin with 22 to 25 rays, instead of 17 to 20, and the lateral line dark instead of whitish; it has a large blackish spot above each pectoral fin - associated in legend with the marks of St Peter's finger and thumb, the haddock being supposed to be the fish from whose mouth he took the tribute-money.
The salt of Wieliczka is well known for its purity and solidity, but has generally a grey or blackish colour.
These differences have given rise to a supposed multiplicity of species, expressed by the names C. lycaon (Central Europe), C. laniger and C. niger (Tibet), the C. occidentalis, C. nubilus, C. mexicanus, &c., of North America, and the great blackish-brown Alaskan C. pambasileus, the largest of them all.
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