Crystalline rock is a type of rock that is composed of interlocking crystals. The term can refer to a variety of rocks, including SPAR (4 letters), GRANITE (7 letters), GEODE (5 letters), SCHIST (6 letters), DIORITE (7 letters), DOLOMITE (8 letters), and SHIST (5 letters). SPAR is a type of crystalline rock that is usually composed of quartz or calcite. GRANITE is a type of igneous rock that is composed of quartz, feldspar, and mica. Geode is a type of rock that is hollow and contains crystals inside. SCHIST is a type of metamorphic rock that is composed of mica and quartz. Diorite is an intrusive igneous rock that is composed of plagioclase and hornblende. DOLOMITE is a type of sedimentary rock that is composed of calcium magnesium carbonate. Shist is a type of metamorphic rock that is composed of mica and quartz.