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A dark green aluminous variety of amphibole, or hornblende.

A dark green igneous rock, consisting largely of chrysolite, with hornblende, augite, biotite, etc.

Pitchblende.

A supposed new element, a radioactive substance discovered by M. and MMe. Curie in pitchblende. It is closely related chemically to bismuth. It emits only alpha rays and is perhaps identical with radium F.

False galena, or blende. See Blende (a).

An intensely radioactive metallic element found (combined) in minute quantities in pitchblende, and various other uranium minerals. Symbol, Ra; atomic weight, 226.4. Radium was discovered by M. and Mme. Curie, of Paris, who in 1902 separated compounds of it by a tedious process from pitchblende. Its compounds color fla…

ic; -- called also ruby sulphur. -- Ruby of zinc (Min.), zinc sulphide; the mineral zinc blende or sphalerite. -- Ruby silver (Min.), red silver. See under Red.

ds are mica schist, and hornblendic schist, consisting chiefly of quartz with mica or hornblende and often feldspar.

Single; not complex; not infolded or entangled; uncombined; not compounded; not blended with something else; not complicated; as, a simple substance; a simple idea; a simple sound; a simple machine; a simple problem; simple tasks.

ous slate (Min.), a soft species of sectile clay slate, impregnated with bitumen. -- Hornblende slate (Min.), a slaty rock, consisting essentially of hornblende and feldspar, useful for flagging on account of its toughness. -- Slate ax or axe, a mattock with an ax end, used in shaping slates for roofs, and making hol…

- Slaty gneiss (Min.), a variety of gneiss in which the scales of mica or crystals of hornblende, which are usually minute, form thin laminæ, rendering the rock easily cleavable.

Zinc sulphide; -- called also blende, black-jack, false galena, etc. See Blende (a).

, reservoir, or fountain; specifically, any course of running water; as, many streams are blended in the Mississippi; gas and steam came from the earth in streams; a stream of molten lead from a furnace; a stream of lava from a volcano.

Containing hornblende in a scattered state; of or relating to rocks containing disseminated hornblende.

Orig., a rock composed of quartz, hornblende, and feldspar, anciently quarried at Syene, in Upper Egypt, and now called granite.

Having the two main flexor tendons of the toes blended together.

aking with a rough surface. It consists chiefly of orthoclase feldspar with sometimes hornblende and mica.

A kind of drama representing some action in which serious and comic scenes are blended; a composition partaking of the nature both of tragedy and comedy. The noble tragi-comedy of "Measure for Measure." Macaulay.

A white variety of amphibole, or hornblende, occurring in long, bladelike crystals, and coarsely fibrous masses.

orium, etc., occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende.