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Partly idiomorphic; -- said of rock a portion only of whose constituents have a distinct crystalline form. -- Hy*pid`i*o*mor"phic*al*ly, adv.

Partly crystalline; -- said of rock which consists of crystals imbedded in a glassy ground mass.

rmed or crystallized at depths the earth's surface; -- said of granite, gneiss, and other rocks, whose crystallization is believed of have taken place beneath a great thickness of overlying rocks. Opposed to epigene.

Anterior in age to the lowest rocks which contain organic remains. Lyell.

Apperaing in distinct crystals; -- said of the mineral constituents of a rock.

Resulting from, or produced by, the action of fire; as, lavas and basalt are igneous rocks.

thing); as, to impregnate India rubber with sulphur; clothing impregnated with contagion; rock impregnated with ore.

An ore deposit, with indefinite boundaries, consisting of rock impregnated with ore. Raymond.

In its natural position or place; -- said of a rock or fossil, when found in the situation in which it was originally formed or deposited.

Not accessible; not to be reached, obtained, or approached; as, an inaccessible rock, fortress, document, prince, etc. -- In`ac*cess"i*ble*ness, n. -- In`ac*cess"i*bly, adv.

substance; to filter into or through something. The water infiltrates through the porous rock. Addison.

cif. (Geol.), to introduce as a bed or stratum, between the layers of a regular series of rocks. Beds of fresh-water shells . . . are intercalated and interstratified with the shale. Mantell.

, to intersperse a book with pictures. Which space is interspersed with small islands and rock. Cook.

Stratified among or between other bodies; as, interstratified rocks.

The cause to enter or force a way, as into the crevices of rocks.

The penetrating of one rock, while in a plastic or metal state, into the cavities of another.

Apt to intrude; characterized by intrusion; entering without right or welcome. Intrusive rocks (Geol.), rocks which have been forced, while in a plastic or melted state, into the cavities or between the cracks or layers of other rocks. The term is sometimes used as equivalent to plutonic rocks. It is then contrasted wi…

Any very hard rock.

al equilibrium in the earth's crust, supposed to be maintained by the yielding or flow of rock material beneath the surface under gravitative stress. By the theory of isostasy each unit column of the earth, from surface to center, has approximately the same weight, and the continents stand higher than the ocean beds ch…

A laminated, granular, siliceous rocks, often occurring in regions where the diamond is found.