In any case, the preponderance of evidence suggests that the population of the USSR didnât buy into the filmsâ pulpy propaganda so much as put up with it and maybe even enjoyed it for its simple escapist chicanery. Cosmic Voyage was almost certainly more fun than it was politically inspirational.
biotite. n. 1. (Minerals) a black or dark green mineral of the mica group, found in igneous and metamorphic rocks. Composition: hydrous magnesium iron potassium aluminium silicate. Formula: K(Mg,Fe)3(Al,Fe)Si3O10(OH)2.
Biotite tends to form in a wider range of conditions than phlogopite which is limited mostly to ultramafic rocks and magnesium rich marbles and pegmatites. Biotite, like other micas, has a layered structure of iron magnesium aluminum silicate sheets weakly bonded together by layers of potassium ions. These potassium ion layers produce the perfect cleavage. Biotite is rarely considered a valuable mineral specimen, but it can accompany other minerals and compliment them.