aragonite

Definitions

  • WordNet 3.6
    • n aragonite a mineral form of crystalline calcium carbonate; dimorphic with calcite
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Webster's Revised Unabridged Dictionary
    • n Aragonite (Min) A mineral identical in composition with calcite or carbonate of lime, but differing from it in its crystalline form and some of its physical characters.
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Century Dictionary and Cyclopedia
    • n aragonite Calcium carbonate crystallizing in the orthorhombic system. It is identical with calcite in chemical composition, but differs from it in crystalline form and in some of its physical properties; for example, its specific gravity is 2.9, while that of calcite is 2.7. It occurs often in transparent acicular crystals, and also as a deposit from waters carrying lime. A white variety, having a delicate coralloid form, is called flos ferri (flower of iron), from the fact of its occurrence with iron ores.
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Chambers's Twentieth Century Dictionary
    • n Aragonite ar′a-gon-īt a variety of calcium carbonate.
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Etymology

Webster's Revised Unabridged Dictionary
From Aragon, in Spain
Chambers's Twentieth Century Dictionary
Aragon, in Spain.

Usage

In literature:

The forms of crystal are chiefly aragonite.
"Cave Regions of the Ozarks and Black Hills" by Luella Agnes Owen
Being isomorphous with aragonite, it crystallizes in the orthorhombic system, but simple crystals are not known.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3" by Various
Aragonite is the least stable form; crystals have been found altered to calcite.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4" by Various
They are both of aragonite.
"Zuñi Fetiches" by Frank Hamilton Cushing
Aragonite is the most familiar example of this form.
"An Elementary Study of Chemistry" by William McPherson
Calcium carbonate may crystallize in either of two forms, calcite or aragonite.
"A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public" by Frank Bertram Wade
Many limestones are rich in aragonite, but this in course of time tends to recrystallize as calcite.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6" by Various
Like aragonite it is very frequently twinned, the compound crystals being pseudo-hexagonal in form.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7" by Various
Aragonite is the more unstable of the two modifications of calcium carbonate.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various
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In news:

The marine snail Limacina helicina antarctica showing acute levels of shell dissolution in Southern Ocean where deep-water upwelling and ocean acidification combined to reduce aragonite saturation in surface waters.
When you need to stock up on amethyst, aragonite, or aventurine (don't we all?
Their shells are made of aragonite that can dissolve rapidly.
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In science:

The solid line in panel (C) depicts the tropical sea surface temperatures relative to today, as inferred from calcite and aragonite shells in the past ∼ 550 Myr [103].
The Spiral Structure of the Milky Way, Cosmic Rays, and Ice Age Epochs on Earth
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