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travertine
(Encyclopedia) travertinetravertinetrăvˈərtĭn, –tēn [key], form of massive calcium carbonate, CaCO3, resulting from deposition by springs or rivers. It is often beautifully colored and banded as a…tufa
(Encyclopedia) tufa: see travertine.onyx
(Encyclopedia) onyxonyxŏnˈĭks [key], variety of cryptocrystalline quartz, differing from agate only in that the bands of which it is composed are parallel and regular. Its appearance is most striking…limestone
(Encyclopedia) limestone, sedimentary rock wholly or in large part composed of calcium carbonate. It is ordinarily white but may be colored by impurities, iron oxide making it brown, yellow, or red…Geysers in the United States
Geysers are natural hot springs that intermittently eject a column of water and steam into the air. They exist in many parts of the volcanic regions of the world such as Japan and South…calcite
(Encyclopedia) calcitecalcitekălˈsīt [key], very widely distributed mineral, commonly white or colorless, but appearing in a great variety of colors owing to impurities. Chemically it is calcium…Trending
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