Correct Answers
Obsidian
Q: The textural term for this specimen is:
a. porphyritic
b. phaneritic
c. aphanitic
d. pegmatitic
e. glassy - correct answers ✔✔Rock class: igneous
A: glassy
Skeletal limestone
Q: The sedimentary structure exhibited by this specimen:
a. ripple marks
b. fossils
c. foliation
d. breccia fragments - correct answers ✔✔Rock class: Sed
A: fossils
gneiss
Q: This rock exhibits:
a. flat planar bedding
b. folding / banding
c. schistose texture
, d. fine grained sand - correct answers ✔✔Rock class: Meta
A: flat planar bedding
Pumice
Q: Which statement about this specimen is TRUE?
a. it has numerous fossils
b. it has a pegmatitic texture
c. it exhibits cross-bedding
d. it has foliation
e. it contains numerous vesicles - correct answers ✔✔Rock class: Sed
A: it contains numerous vesicles
Lightweight
Arkose
Q: Which statement most correctly describes this specimen?
a. its frothy texture indicates a volcanic origin
b. it is composed mainly of quartz and feldspar grains
c. it has a porphyritic texture
d. it is foliated
e. it contains numerous fossils - correct answers ✔✔Rock class: Sed
A: it is composed mainly of quartz and feldspar grains
Siltstone
Q: The grain size of this sample is mostly:
a. clay sized
b. coarse sand