A mineral of the monoclinic crystal system which consists of a hydroxide and aluminosilicate of manganese, and occurs as minute orange-red pleochroic flakes.
Origin
1940s. From the name of Thomas Pennant, Welsh zoologist and mineralogist + -ite.
Definition of pennantite in US English:
pennantite
nounˈpɛnəntʌɪt
Mineralogy
A mineral of the monoclinic crystal system which consists of a hydroxide and aluminosilicate of manganese, and occurs as minute orange-red pleochroic flakes.
Origin
1940s. From the name of Thomas Pennant, Welsh zoologist and mineralogist + -ite.