They're

  only

Bywoord

  made of

  rock crystal

,  and

Koördinerende konjunksie

  there are

  millions

Selfstandige naamwoord

  of

Aanneming

  rock crystals

  in

Aanneming

  the

Bepaler

  earth

Selfstandige naamwoord

.

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.