They're

  only

Przysłówek

  made of

  rock crystal

,  and

Spójnik współrzędny

  there are

  millions

Rzeczownik

  of

Przyimek

  rock crystals

  in

Przyimek

  the

Wyznacznik

  earth

Rzeczownik

.

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

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