OTHER IGNEOUS TEXTURES: GLASSY - looks like glass due to extremely fast cooling, no crystals are able to form, commonly have concoidal fracture (obsidian) PYROCLASTIC - hot volcanic fragments are blasted into the air and cooled quickly, lava is "sprayed" out of a because gasses are trapped in rock as it cools VESICULAR - rock is full of holes (look like a sponge) volcano to form tiny glass shards (pumice) PORPHYRITIC - refers to an igneous rock that has large visible minerals in a fine crystalline ground mass (background), there may be one or more kinds of minerals that are visible, these visible crystals are called phenocrysts, this texture can be observed in both intrusive and extrusive rocks.
(GLASSY; looks; like glass) (PYROCLASTIC - hot volcanic fragments; cooled quickly; ) (lava; is; sprayed" out of a; because gasses are trapped in rock as it cools VESICULAR - rock is full of holes) (an igneous rock; has; large visible minerals; L:in a fine crystalline ground mass) (no crystals; to form; ) (this texture; can be observed; L:in both intrusive and extrusive rocks) (volcano to form tiny glass shards (pumice); refers; to an igneous rock) (gasses; are trapped; in rock; T:as it cools VESICULAR - rock is full of holes) (these visible crystals; are called; phenocrysts) (minerals; are; visible)
GLASSY PYROCLASTIC - hot volcanic fragments lava an igneous rock no crystals this texture volcano to form tiny glass shards (pumice) gasses these visible crystals minerals
looks cooled quickly is has to form can be observed refers are trapped are called are
like glass
sprayed" out of a because gasses are trapped in rock as it cools VESICULAR - rock is full of holes
large visible minerals L:in a fine crystalline ground mass
L:in both intrusive and extrusive rocks
to an igneous rock
in rock T:as it cools VESICULAR - rock is full of holes
phenocrysts
visible