-
opposite properties in the
formation of crystals.
Euhedral (also
known as
idiomorphic or automorphic)
crystals are
those that are well-formed, with sharp,...
-
bounded by its
characteristic faces, well-formed.
Synonymous terms:
idiomorphic, automorphic; Subhedral: a
crystal partially bounded by its characteristic...
- 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...
- later-formed less
perfect crystals ('oikocrysts')
surround smaller early-formed
idiomorphic crystals ('chadacrysts') of
other minerals. A
poikilitic texture is most...
-
grains mingled with the
other components of the rock. Large,
nearly idiomorphic crystals are
sometimes found in
argillaceous rocks (altered calcareous...
-
plutonic rocks such as
gabbro (norite) and diorite. It may form
small idiomorphic phenocrysts and also groundm****
grains in
volcanic rocks such as basalt...
- (approximated); Z = 3
Identification Color Pink (pale)
Crystal habit idiomorphic crystals (max. 3 cm)
Cleavage None
Fracture Conchoidal Mohs
scale hardness...
-
additional accessories in the syenogranite. Some
syenogranite contain rare
idiomorphic amphibole (Fe-hornblende and Fe-edenite),
biotite (annite 25%-35%), plagioclase...
-
crystal faces peculiar to the species, used of minerals.
Synonymous with
idiomorphic.
eustatic movements Changes of sea level,
constant over wide areas, due...
-
highly twinned unmixed grains in vanadium-bearing
rutile that
occurs as
idiomorphic crystals in kornerupine-bearing quartz-biotite-sillimanite gneiss. It...
