hydrothermally

Rocks on the north part of the island are hydrothermally altered.

High quality crystals may be grown hydrothermally, or otherwise by the Verneuil method.

The studies demonstrated that the most volcanically and hydrothermally active area was along the southern rift.

It is the most hydrothermally active volcano known in the Kermadec Arc.

Oceanic crust is hydrothermally altered causing addition of quartz and sodium.

Today Tairus is a major supplier of hydrothermally grown gemstones to the jewellery industry.

At times the solvent is used under pressure at temperatures higher than the normal boiling point (hydrothermally).

It occurs in hydrothermally altered dolomite and marble.

It also occurs in skarn, pegmatite and hydrothermally altered volcanic rocks.

Host rocks are commonly strongly hydrothermally altered.

Parts of the feldspar porphyry are hydrothermally altered.

These rocks, similar to those from the Pilbara Region in Australia, were hydrothermally altered.

It has been shown to form hydrothermally in near-supercritical water at temperatures above 350 C and in presence of alkaline conditions.

Hot, hydrothermally altered ground and relatively weak fumaroles, but no active hot springs, are found on these volcanoes.

Zunyite occurs in highly aluminous shales and hydrothermally altered volcanic rocks.

The slopes of the peak are highly unstable, consisting of weak, hydrothermally altered felsic rocks.

Agios Nikolaos is famous for its hydrothermal crater and the coastal area is rarely hydrothermally active.

Parts of Takawangha's edifice are hydrothermally altered and may be unstable, and could produce localized debris avalanches.

Shrimp swimming above a hydrothermally active crack in basalt on the SEPR near 17 27'S.

Chromite may hydrothermally alter to stichtite, and pentlandite may retrogress into millerite or heazlewoodite.

Benitoite (ben-EE-toe-ite) is a rare blue barium titanium silicate mineral, found in hydrothermally altered serpentinite.

Eight of these hydrothermal explosion craters are in hydrothermally cemented glacial deposits, and two are in Pleistocene ash-flow tuff.

In hydrothermally altered igneous rock, pseudomorphic replacement of calcic plagioclase by albite is common, often in cases where relict primary textures are preserved.

Ash generated during phreatic eruptio[e]ns consists primarily of hydrothermally altered lithic and mineral fragments, commonly in a clay matrix.

Researchers in July 2010 suggested that carbonate bearing rocks found in the Nili Fossae region of Mars are made up of hydrothermally altered ultramafic rocks.