Hydrated sulphate of magnesium, with potassium chloride, which crystallizes in the monoclinic system. It usually occurs in salt deposits.
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A chemical signal produced by one species of animal which influences the behaviour of members of another species, to the benefit of the recipient. Cf allomone.
A volcanic rock containing phenocrysts of olivine, titanaugite, barkevikite and anorthoclase, probably a hybrid between basalt and trachyte,
TN for a hard insulating material, not affected by oil, used for spreaders in cable joints,
Silicate of potassium and aluminium, which crystallizes in the hexagonal system. It has a similar composition to kalsilite and is probably metastable at all temperatures at atmospheric pressure,
A periodic combination of two triode valves for obtaining negative resistance,
A variety of nickeliferous iron, found in meteorites; it usually contains about 5-5% nickel. Metal- lurgically, alpha-iron,
A mound of gravel and sand which was formed by the deposition of the sediment from a stream as it ran from beneath a glacier. Kames are thus often found on the outwash plain of glaciers,
A collective term for the kaolin minerals or members of the kaolinite group. These include kaolinite, dickite, nacrite, anauxite, halloysite, meta-halloysite and allophane.