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opposite properties in the formation of crystals. Euhedral (also known as idiomorphic or automorphic) crystals are those that are well-formed, with sharp,...
Click to read more »bounded by its characteristic faces, well-formed. Synonymous terms: idiomorphic, automorphic; Subhedral: a crystal partially bounded by its characteristic...
Click to read more »later-formed less perfect crystals ('oikocrysts') surround smaller early-formed idiomorphic crystals ('chadacrysts') of other minerals. A poikilitic texture is most...
Click to read more »left between the already-formed crystals. The former case is said to be idiomorphic (or automorphic); the latter is xenomorphic. There are also many other...
Click to read more »plutonic rocks such as gabbro (norite) and diorite. It may form small idiomorphic phenocrysts and also groundmass grains in volcanic rocks such as basalt...
Click to read more »(approximated); Z = 3 Identification Color Pink (pale) Crystal habit idiomorphic crystals (max. 3 cm) Cleavage None Fracture Conchoidal Mohs scale hardness...
Click to read more »grains mingled with the other components of the rock. Large, nearly idiomorphic crystals are sometimes found in argillaceous rocks (altered calcareous...
Click to read more »polarized light). Gabrielite is a sulfosalt mineral species occurring as idiomorphic crystals commonly found in cavities of Triassic dolomite. The physical...
Click to read more »fulfil their subsidiary function: on the other hand it is usual that the idiomorphic symbols appear in peripheral or marginal areas, or in those which are...
Click to read more »with variable angles. Volcanic rocks show a porphyric structure with idiomorphic phenocrysts (1-4 mm) of feldspar and quartz that appears to have completely...
Click to read more »high-titanium, normative tholeiitic basalt The main mineral phases are idiomorphic or sub-idiomorphic plagioclase and augitic clinopyroxene. During post eruption...
Click to read more »highly twinned unmixed grains in vanadium-bearing rutile that occurs as idiomorphic crystals in kornerupine-bearing quartz-biotite-sillimanite gneiss. It...
Click to read more »crystal faces peculiar to the species, used of minerals. Synonymous with idiomorphic. eustatic movements Changes of sea level, constant over wide areas, due...
Click to read more »both porphyritic and as an ingredient of the ground mass. It is always idiomorphic with rounded outlines. The feldspar ranges from bytownite to oligoclase...
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