idiomorphic


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idiomorphic

[¦id·ē·ō¦mȯr·fik]
(petrology)
References in periodicals archive ?
They are made of idiomorphic crystals of diopside, 1 to 5 cm length, and scarce xenomorphic orthopyroxene.
General appearance: Rosette aggregates about 1 mm in diameter composed of idiomorphic crystals about 0.
The continuous normal zoning displayed by plagioclase in the two analysed samples for the present study, characterised by Ab-rich contents towards the rim of idiomorphic prisms (Fig.
4% orthoclase), the original twinning structure is still apparent, except where plagioclase bas altered to illite or carbonates, Idiomorphic olivine is present as microporphyroblasts, nearly always completely altered.
Secondary electron and TEM images show that the green material constituting the needle-like coating of the filaments actually consists of idiomorphic lath-like crystals < 10.
The altered diorites are fine-to coarse-grained, inequigranular and are characteristically porphyritic, but some rocks show typically idiomorphic porphyritic and poikilitic textures.
The vein fillings are composed of loose crystals, from a few micrometers to 1 mm in size, of rhombohedral habit and of a pale to dark brown colon Sometimes the crystals show an idiomorphic habit, and a compositional zoning can be observed by BEI, with an inner zone of Na/K > 1 (natrojarosite) and an outer zone with Na/K < 1 (jarosite).
Several monazite and zircon crystals were carefully selected by picking the most idiomorphic crystals to avoid all possibility of inheritance for ID-TIMS.
The gabbro-norites are sub- equigranular, medium- to coarse-grained, hypidiomorphic to idiomorphic and massive, i.
Superb, idiomorphic, La-dominant allanite / REE-rich epidote crystals have been found in the Nueva Vizcaya mine, Burguillos del Cerro (Badajoz Province).
In some gneisses, and in the previously described schists, there are also small idiomorphic or subidiomorphic garnets (Fig.