| 释义 |
braun·ite
\ˈbrau̇ˌnīt\ noun
(-s)
Etymology: Councilor Braun, 19th century German treasury official + English -ite
: a brittle brownish black or steel-gray mineral that consists of manganese silicate and occurs massive and as tetragonal crystals (hardness 6-6.5, specific gravity 4.75-4.82) |