Mineralogy Glossary

noun the hollow between a woman's breasts when supported, especially as revealed by a low-cut neckline

• The scientist studied the formation of cleavage in the mineral sample.
• She wore a dress that showed off her cleavage.
• Check out the cleavage on that top!
• There was a clear cleavage between the two political parties on the issue.

noun a mineral deposit consisting of a layer or crust of small crystals on the walls of a cavity or geode

• The mineral specimen exhibited a beautiful druse of crystals.
• I found a cool druse of crystals while hiking in the mountains.
• Check out the sick druse I scored at the gem show!
• Her personality was like a druse, with many facets shining through.

adjective a term used to describe something resembling or having the characteristics of adamant, which is a hard, unbreakable substance

• The adamantoid structure of the mineral made it extremely hard and resistant to scratching.
• I found an adamantoid rock while hiking in the mountains, it's so cool!
• That adamantoid phone case is super durable, it can survive any drop!
• Her adamantoid personality made it difficult for others to change her mind.

noun a rare type of granitic rock containing a high percentage of orthoclase feldspar

adjective relating to or characteristic of adamellite rock

• The geologist identified the rock as adamellite due to its composition of quartz, feldspar, and biotite.
• I found a cool adamellite rock while hiking in the mountains.
• Check out this shiny adamellite I picked up by the river!
• Her personality was as solid and enduring as adamellite, never wavering in the face of challenges.