asbestivabad magneesiumi, alumiiniumi ja raua looduslikud silikaadid, mida on paisutatud kuumutamise teel
any of a group of micaceous minerals consisting mainly of hydrated silicate of magnesium, aluminium, and iron: on heating they expand and exfoliate and in this form are used in heat and sound insulation, fireproofing, and as a bedding medium for young plants
Vermikuliit on vilgukivi meenutav helepruunikas pehme läikiv kivim, mida kasutatakse mullasegudes niiskuse hoidmiseks ja õhustatuse parandamiseks. Vermikuliit tõstab mõnevõrra kasvupinnase aluselisust, mistõttu väheneb lupjamistarve. Ka vermikuliidi mahukaal on väike, mistõttu seguneb halvasti turbaga.
When rapidly heated to about 300° C (570° F), vermiculite can expand to 20 times its original thickness; its name, from the Latin word meaning “to breed worms,” alludes to this property. In its natural state the mineral has little commercial use, but exfoliated vermiculite is extremely light (specific gravity as low as 0.09) and is used in lightweight concrete or plaster, for thermal and acoustic insulation, or as a packing medium, a soil conditioner, a starting medium for seeds, and a filler or extender in paper, paint, or plastics.
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