Gneiss is called bastard granite.是什么意思？

Gneiss is called bastard granite.

片麻岩叫作粗花岗岩.

gneiss

n. 片麻岩；

例句
Felsic gneiss is the most widely distributed rock type in Archean metamorphic complex areas.
长英质片麻岩是太古宙变质杂岩区最主要的岩石类型.

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

called

v. 叫( call的过去式和过去分词 )，通电话，认为，估计；

例句
He has also called for an acceleration of political reforms.
他同时呼吁加快政治改革的步伐。

bastard

n. 私生子，杂种，代用品，假冒品，态度傲慢且令人讨厌的人；adj. 杂种的，不纯粹的，伪的，假的，奇形怪状的，异常的；

例句
...King Arthur's bastard son, Mordred.
亚瑟王的私生子莫德雷德

granite

n. 花岗岩，花岗石，坚毅，坚韧不拔；

例句
'Well,' I said, grinding my cigarette nervously into the granite step.
“好吧，”我边说边紧张不安地把香烟在花岗岩台阶上捻灭。