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greenstone
This term refers specifically to a category of metamorphic rocks characterized by their green hue, typically resulting from the presence of minerals like epidote, actinolite, or chlorite. It is most frequently encountered in geological surveys or in the context of archaeology and art history, particularly when discussing the materials used for ancient tools or ceremonial carvings.
As a mass noun referring to a type of mineral substance, it is typically used without a plural form. When referring to a specific object made from the material, such as a "greenstone axe," the countability shifts to the object rather than the material itself.
Meanings
Examples
The museum displays several ancient axes carved from greenstone.
This particular vein of greenstone is remarkably dense.
This particular vein of greenstone is remarkably dense.
I wonder if this sculpture was made from local greenstone.
The geologist identified the sample as a type of greenstone.
Look at the deep olive hue of this polished greenstone.
Ancient peoples prized greenstone for its durability and color.
The walls of the old fortress were reinforced with greenstone blocks.
The walls of the old fortress were reinforced with greenstone blocks.
Is this genuine greenstone or just a dyed imitation?