the mica group of sheet silicate phyllosilicate minerals includes several closely related materials having nearly perfect basal cleavage. all are monoclinic, with a tendency towards pseudohexagonal crystals, and are similar in chemical composition.
mineral oil is any of various colorless, odorless, light mixtures of higher alkanes from a mineral source, particularly a distillate of petroleum, as distinct from usually edible vegetable oils. the name mineral oil by itself is imprecise, having been used for many specific oils over the past few centuries. other names, similarly imprecise, include white oil, paraffin oil, liquid paraffin, paraffinum liquidum, and liquid petroleum. baby oil is a perfumed mineral oil. most often, mineral oil is a
peridotite is the dominant rock of the earth's mantle above a depth of about 400 km; below that depth, olivine is converted to the higher-pressure mineral wadsleyite.oceanic plates consist of up to about 100 km of peridotite covered by a thin crust; the crust, commonly about 6 km thick, consists of basalt, gabbro, and minor sediments.
a 'mineral make-up' may be all mineral, part mineral – or contain less than 1% mineral as part of the finished formula. using this logic, practically all make-up could be considered mineral. water-based makeup appeared after the end of world war ii , with emulsifiers that could successfully keep a water-and-oil blended emulsion stable being the key to their development.
the identification of these mineral fragments led to the bold hypothesis that a large portion of the moon was once molten, and that the crust formed by fractional crystallization of this magma ocean. a natural outcome of the hypothetical giant-impact event is that the materials that re-accreted to form the moon must have been hot. current .
calculus was a term used for various kinds of stones. this spun off many modern words, including 'calculate' use stones for mathematical purposes , and 'calculus', which came to be used, in the 18th century, for accidental or incidental mineral buildups in human and animal bodies, like kidney stones and minerals on teeth.
shungite is a black, lustrous, non-crystalline mineraloid consisting of more than 98 weight percent of carbon. it was first described from a deposit near shunga village, in karelia, russia, from where it gets its name.shungite has been reported to contain trace amounts of fullerenes 0.0001 < 0.001% .
a lake pigment is a pigment made by precipitating a dye with an inert binder, or 'mordant', usually a metallic salt. unlike vermilion, ultramarine, and other pigments made from ground minerals, lake pigments are organic. manufacturers and suppliers to artists and industry frequently omit the lake designation in the name.
it is difficult to study mudrock constituents, due to their diminutive size and susceptibility to weathering on outcrops; and most importantly, there is more than one classification scheme accepted by scientists; mudrocks make up fifty percent of the sedimentary rocks in the geologic record, and are easily the most widespread deposits on earth.
tiger's eye also called tiger eye is a chatoyant gemstone that is usually a metamorphic rock with a golden to red-brown colour and a silky lustre.as members of the quartz group, tiger's eye and the related blue-coloured mineral hawk's eye gain their silky, lustrous appearance from the parallel intergrowth of quartz crystals and altered amphibole fibres that have mostly turned into limonite.
many mineral based makeup create a barrier between the skin and outside elements, which allows it to provide some protection against the sun and its possible harmful effects. mineral makeup is noncomedogenic as long as it does not contain talc and offers a mild amount of sun protection because of the titanium dioxide and zinc oxide .