thomsonite

noun
thom·​son·​ite | \ˈtäm(p)səˌnīt\
plural -s

Definition of thomsonite 

: a mineral NaCa2Al5Si5O20.6H2O of the zeolite family consisting of a hydrous silicate of aluminum, calcium, and sodium, occurring generally in masses of a radiated structure or rarely in distinct orthorhombic crystals, and being snow-white when pure (hardness 5–5.5)

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History and Etymology for thomsonite

Thomas Thomson †1852 Scottish chemist + English -ite

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