Journey to the center of the Earth Crossword

This printable crossword puzzle on the topic of Rocks & Minerals has 15 clues. Answers range from 5 to 18 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

shape of a cristal
prints of a substance left behind
prints of a fossil left behind
Al-rich endmember
fassaites
a similar substance to granite
salt that contains oxygen and tungsten
a chemical that is in multiple types of iron MN
from the Greek sphenos
a chemical element and symbol Zr
easily achieved
slight and pardonable
enthusiasm or passion
containing nitrogen with a higher valence
given reason to be respected