An user English
says…

They're
  only
Adverb
  made of
  rock crystal
and
Coordinating conjunction
  there are
  millions
Noun
  of
Adposition
  rock crystals
  in
Adposition
  the
Determiner
  earth
Noun
.

They're only made of rock crystal, and there are millions of rock crystals in the earth.
Words and sentences
New
only

New
made of

simple past and past participle of make of

New
rock crystal

clear, colourless form of the silica-based mineral quartz, often called "pure quartz" or "clear quartz".

New
and

New
millions

plural of million

New
of

New
in

New
earth

Comments