anorthoclase
noun
an·or·tho·clase
əˈnȯrthəˌklās,
-āz
plural -s
: a feldspar of chiefly sodium potassium aluminum silicate that is closely related to orthoclase but triclinic
Word History
Etymology
International Scientific Vocabulary an- + orthoclase; originally formed as German anorthoklase
First Known Use
1888, in the meaning defined above