#initial-load-header-loader { visibility: hidden!important; } #initial-load-content { visibility: visible!important; } .expandable .expandable-control { display: none!important; } .expandable .expandable-content { display: block!important; visibility: visible!important; max-height: none!important; height: auto!important; }

dark mineral

noun Geology.

any rock-forming mineral that has a specific gravity greater than 2.8 and that is generally dark in color.

RELATED CONTENT

Read more in this article about some frequently asked questions and fun facts related to our definitions.

hello darkness, my old friend

Read more in this article about some frequently asked questions and fun facts related to our definitions.

Compare light mineral.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019