Igneous Rocks

1. a means of ranking common igneous silicate minerals by the temperature at which they crystallize.
5. an igneous rock texture in which large crystals are set in a finer-grained or glassy groundmass.
8. molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface.
12. chemical element of the alkali metal group (Group 1 [Ia]) of the periodic table.
14. refers to the details of its visible character.
16. is a continuous mineral series in which calcium and sodium substitute for one another in the same crystal structure.
18. an intrusive igneous rock formed by the slow cooling underground of magma (molten rock) that has a moderate content of silica and a relatively low content of alkali metals.
19. is a silicate mineral in the common mica group.
22. is a hard, black volcanic rock with less than about 52 weight percent silica (SiO2).
23. formed from the cooling and solidification of molten (melted) rock.
24. is a common plutonic rock, of variable texture and coarseness, that is composed of interlocking crystals of widely different sizes.

2. is a magnesium iron silicate with the chemical formula (Mg,Fe) 2SiO 4.
3. a salt in which the anion contains both silicon and oxygen
4. a stage-wise separation technique that relies on the liquid-solid phase change.
5. is the most significant and abundant group of rock-forming ferromagnesium silicates.
6. igneous rock is produced when magma exits and cools above (or very near) the Earth's surface.
7. an extrusive rock intermediate in composition between rhyolite and basalt.
9. is a dark-coloured, heavy, often altered and brecciated (fragmented), intrusive igneous rock that contains diamonds in its rock matrix.
10. the transformation of some fraction of the mass of a solid rock into a liquid as a result of decompression, heat input, or addition of a flux.
11. the most silica-rich of volcanic rocks
13. a very dense, coarse-grained, olivine-rich, ultra- mafic intrusive rock.
15. an igneous rock, which means it formed from magma, or melted rock.
17. igneous rocks that form when magma cools under the earth's surface.
20. is a volcanic rock texture characterized by a rock being pitted with many cavities (known as vesicles) at its surface and inside.
21. is a nutrient that the body needs to stay healthy.