Geology A-Z

Guess these rocks, minerals, and other things about geology whose names start with each letter A-Z.

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Last updated: July 10, 2023

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	Description	Answer
A	Commonest pyroxene mineral	Augite
B	Makes up more than 90% of all volcanic rocks	Basalt
C	Type of boundary where subduction occurs	Convergent
D	Hardest known mineral	Diamond
E	What the root word "geo" means in geology	Earth
F	Other name for dark silicates. Think Fe plus Mg	Ferromagnesium
G	What obsidian is made of	Glass
H	Mineral with a iconic, rust red streak	Hematite
I	Nonsilicates are divided by their negatively charged ______	Ions
J	"Dalmatian ______"	Jasper
K	Country in East Africa with a rift valley	Kenya
L	Rock that reacts with HCL (hydrochloric acid)	Limestone
M	Era after the Paleozoic	Mesozoic

	Description	Answer
N	Silver, copper, and sulfur are examples of ____ element minerals	Native
O	Amber, coal, and chalk are these rocks	Organic
P	Country ranking in the top 10 leading producers of gold	Peru
Q	Citrine is a variety of this mineral	Quartz
R	Corundum's two gemstones: sapphire and _____	Ruby
S	One of three rock types	Sedimentary
T	Halite's distinctive feature	Taste
U	Mineral that contains a radioactive element used in Fat Man	Uraninite
V	Nyamuragira is a famous one of these	Volcano
W	Last name of the "continental drift" theorist	Wegener
X	Rock fragment trapped in another rock	Xenolith
Y	What the Earth has 4.5 billion of	Years
Z	Fake diamond	Zirconia