dark mineral

noun

, Geology.

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

Example Sentences

Alongside that daunting tuna jaw might be kalderetang kambing, goat braised in tomato purée, with green olives leaching brine and liver pâté extending its dark mineral contour.

From New York Times

Miners hunt near Bangka’s surface for veins of cassiterite, a dark mineral that is the principal tin ore, and virtually all of the work is done by hand.

From BusinessWeek

The still-hidden darling of thy heart was resting before thy eyes like a little angel sculptured on a grave-stone, and pointing with its small finger to the hour when thou shouldst die; and every morning and every evening, thou thoughtest of death, with a certainty, of which I yet knew not the reasons; and to thee it was as if the Earth were a dark mineral cave where man's blood like stalactitic water drops down, and in dropping raises shapes which gleam so transiently, and so quickly fade away!

From Project Gutenberg

The still hidden darling of thy heart was resting before thy eyes like a little angel sculptured on a gravestone, and pointing with its small finger to the hour when thou shouldst die; and every morning and every evening thou thoughtest of death with a certainty of which I yet knew not the reasons; and to thee it was as if the Earth were a dark mineral cave, where man's blood, like stalactitic water, drops down, and in dropping raises shapes which gleam so transiently, and so quickly fade away!

From Project Gutenberg

Hornblende is a dark mineral which contains considerable iron.

From Project Gutenberg