tridymite

IPA: trˈaɪdʌmaɪt

(mineralogy) A rare mineral of volcanic rocks that solidified at a high temperature, with the chemical composition silicon dioxide, SiO₂. Tridymite is chemically identical to quartz, but has a different crystal structure. Sometimes contains sodium aluminum silicate, which seems to be expelled when quartz solidifies at lower temperatures.

Examples of "tridymite" in Sentences

The groundmass contains interstitial quartz or tridymite or cristobalite.
Quartz, tridymite and cristobalite are the three most common types of crystalline silica.
Safety Commission [NOHSC] set guidelines for crystalline silica dust as cristobalite, quartz and tridymite as 0. 1mg / m3 respectively.
But they were surprised to find cristobalite and tridymite crystals, because they require flash-heating events, such as shock waves, to form.
These other forms of silica include opal, chalcedony, flint and chert (non-crystalline), and cristobalite, tridymite, coesite, and stichovite.
Volcanic ash may contain varying proportions of free crystalline silica (silicon dioxide, SiO2) in the form of quartz, cristobalite, or tridymite minerals.
It is this high-temperature form of silica crystals, specifically cristobalite and tridymite, that Forrest's team found in planet-forming disks around other stars for the first time.
It is these high-temperature forms of silica crystals, specifically cristobalite and tridymite, that Forrest's team found in planet-forming disks around other stars for the first time.
People will generally be very concerned about the effects of ash, and questions usually arise about the content of the ash, particularly regarding the minerals quartz, cristobalite, or tridymite.