micaceous mineral, 1814, from Latin vermiculari (from vermiculus, diminutive of vermis "worm," from PIE root *wer- (2) "to turn, bend") + -ite. So called from its reaction when heated.
Entries linking to vermiculite
*wer- 2
Proto-Indo-European root forming words meaning "to turn, bend."
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit vartate "turns round, rolls;" Avestan varet- "to turn;" Hittite hurki- "wheel;" Greek rhatane "stirrer, ladle;" Latin vertere (frequentative versare) "to turn, turn back, be turned; convert, transform, translate; be changed," versus "turned toward or against;" Old Church Slavonic vrŭteti "to turn, roll," Russian vreteno "spindle, distaff;" Lithuanian verčiu, versti "to turn;" German werden, Old English weorðan "to become;" Old English -weard "toward," originally "turned toward," weorthan "to befall," wyrd "fate, destiny," literally "what befalls one;" Welsh gwerthyd "spindle, distaff;" Old Irish frith "against."
-ite 1
word-forming element indicating origin or derivation from, from French -ite and directly from Latin -ita, from Greek -ites (fem. -itis), word-forming element making adjectives and nouns meaning "connected with or belonging to." Especially used in classical times to form ethnic and local designations (for example in Septuagint translations of Hebrew names in -i) and for names of gems and minerals.