Igneous Rock Textures

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I J Y K O L Q M E R L M W A B P G T N F D
B S K N N T V M B I A B V T W T U V G W L
T U E M I H C O U C D L Y R K C A J Y A W
X O J E A M O G T K I C X X M R E G B N L
J E R N M E C K H C O I B V A D J I H N F
Q R T I Y L T A O O H W U M F J B C X O O
N T L L G E Y F L R T G U N I K W P S K J
V I H A D N S V O C I G A B C C R L Q L D
F V S T A O G U C I L S E B B V D E H I A
Q C F S L C H M R D C X Q E A O J A J Q E
B I F Y O R W I Y I I K U O S V G U A L V
I T Q R I A P K S C T M I X I H Y O R L Q
N I R C D T W E T A I R G U C I T C G C D
I A R I A I P K A C N N R O R Y F R R N A
H H G M L C S F L I A Y A B O M M A G V Q
N P F E G L K O I C H R N X C R B T I C F
T A T H S E C J N L P E U X K V M I K I C
B O G P H Q Q Q E E A G L A S N L C W O I
L G P J U J E J W F I J A P V M U Q I W U
J D K U C K F H S T G M R H A V A G H N D
B O J X V O V F A T W C M K B C J Y F W E

Clues

  • 0-30% dark minerals (11)
  • 60%-100% dark (12)
  • mineral grains are all roughly the same size (12)
  • Partly crystals and partly glass (14)
  • rock is shiny and glassy in appearance, but it not holohyaline. (8, 8)
  • rock is stony or granular in appearance. (9, 9)
  • Rocks dominated by dark coloured minerals. (10, 5)
  • rocks dominated by light coloured minerals. Rock normally dominated by quarts, feldspars and muscovites. (12, 4)
  • vesticles in rock are filled with a secondary mineral introduced after the consolidation of the rock. (12)
  • Wholly crystalline. (14)

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