What is meant by granular texture?
A rock texture resulting from the aggregation of mineral grains of approx. equal size. The term may be applied to a sedimentary or metamorphic rock, but is esp. used to describe an equigranular, holocrystalline igneous rock whose particles range in diameter from 0.05 to 10 mm.
What does Phaneritic texture mean in geology?
The environment of formation produces characteristic textures in igneous rocks which aid in their identification. These textures are: Phaneritic – This texture describes a rock with large, easily visible, interlocking crystals of several minerals.
What is Holohyaline texture?
Holohyaline texture A term applied to igneous rocks that have a glassy texture. Holohyaline rocks were generally cooled rapidly, which inhibits growth rate and nucleation of crystals. A few tiny crystals, called microlites, may be present.
What is Poikilitic texture in geology?
Poikilitic texture describes the occurrence of one mineral that is irregularly scattered as diversely oriented crystals within much larger host crystals of another mineral.
What does too granular mean?
Something granular has a grainy texture. Granular sugar is the white kind you find in sugar bowls, and a sandy beach is very granular, too. Anything that’s made of tiny bits like sand or grain can be called granular. When you see the word granular, think “grain of sand.” Or — “grain of sugar” if that’s more your style.
What does granular level mean?
highly detailed; having many small and distinct parts: data analysis on a granular level.
What does Equigranular?
: having or characterized by crystals of nearly the same size a rock of equigranular texture.
What causes ophitic texture?
Keweenaw rift rocks include a somewhat rare textural variety of basalt called ophite or ophitic basalt. The rate of heat loss (undercooling or supercooling) during the solidification is thus thought to cause ophitic texture, where pyroxene is growing rapidly and plagioclase is forming many more nuclei.
How is ophitic texture formed?
Ophitic texture, a variant the poikilitic texture, is one where random plagioclase laths are enclosed by pyroxene or olivine. If plagioclase is larger and encloses the ferromagnesian minerals, then the texture is subophitic and the laths typically impinge on one another to form sharp angles.
What do people mean by granular?
1 : consisting of or appearing to consist of granules : grainy. 2 : finely detailed granular reports.
Is the texture of igneous rocks hypidiomorphic?
Of the texture of igneous rocks, having the crystals bounded partly by the crystal faces characteristic of the mineral species. Also known as hypautomorphic; subidiomorphic.
Which is the best definition of hypidiomorphic granite?
The granite displays medium-grained, hypidiomorphic to, less commonly, allotriomorphic, subequigranular to equigranular, and sparingly granophyric fabric. The ores mainly comprise cataclastic, idiomorphic or hypidiomorphic granular, and gric textures.
Which is the best definition of granular texture?
Definition of granular texture A rock texture resulting from the aggregation of mineral grains of approx. equal size. The term may be applied to a sedimentary or metamorphic rock, but is esp. used to describe an equigranular, holocrystalline igneous rock whose particles range in diameter from 0.05 to 10 mm.
What kind of texture does a rock have?
hypidiomorphic-granular, texture dominated by subhedral crystal; and allotriomorphic-granular for texture dominated by anhedral crystals. Cumulus texture is for a rock composed of ehuderal minerals .