by·tow·nite 
(bī-tounīt)
(bī-tounīt)n.
A blue to dark-gray variety of plagioclase feldspar that contains a higher proportion of calcium than sodium and occurs in alkaline igneous rocks.
[After Bytown, former name of Ottawa, Ontario, near where a sample of the mineral was found.]
- heterochronic
- heterochronous
- heterochrony
- heterocycle
- heterocyclic
- heterocyst
- heterodactyl
- heterodactylous
- heterodactyly
- heterodox
- heterodoxy
- heterodyne
- heteroecious
- heteroecism
- heterogamete
- heterogametic
- heterogamic
- heterogamous
- heterogamy
- heterogeneity
- heterogeneous
- heterogeneously
- heterogeneousness
- heterogenic
- heterogenous