According to Wiki Answers:
These terms refer to the crystalline structure of the minerals that are present in a body of rock. Rocks with an interlocking mineral structure have formed from melt or from recrystallization and therefore are igneous or metamorphic. Their crystals have formed in a set order of crystallization, filling the spaces fully between them. Examples are granite, basalt, schist, and phyllite.
Non-interlocking rock structures are usually clastic sedimentary rocks, which are formed from the compaction and cementation of rock particles of various types. Compaction and cementation will leave air and fluid spaces between rock particles which, although cemented together, are not interlocking. Examples are sandstone, limestone, and shale.
In addition, some rocks of each type are:
Interlocking: Granite, Gabbro, Pumice, Basalt, Slate, Hornfels, Schist, Gneiss.
Non-interlocking: Shale, Chalk, Limestone, Sandstone, Clay.
For a good comprehensive rock resource, check out http://geology.com/.
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