A silicate of iron and magnesium, (Fe,Mg)₃Si₄O₁₀(OH)₂ crystallizing in the triclinic system and occurring as dull or waxy greenish-grey plates or needles.
Origin
1940s. From the name of Minnesota + -ite.
Definition of minnesotaite in US English:
minnesotaite
nounˌmɪnɪˈsəʊtəˌʌɪt
Mineralogy
A silicate of iron and magnesium, (Fe,Mg)₃Si₄O₁₀(OH)₂ crystallizing in the triclinic system and occurring as dull or waxy greenish-grey plates or needles.