To return to the last page click on your browsers back button.
Physical Characteristics of Trona:
Color: is gray, colorless, white, pale brown or yellowish.
Luster: is vitreous.
Transparency: Crystals are transparent to translucent.
Crystal System: is monoclinic; 2/m.
Crystal Habits include prismatic to blocky crystals, but usually massive, fibrous or columnar.
Cleavage: is perfect in one direction and poor in two others.
Fracture: is subconchoidal to uneven.
Hardness: is 2.5 - 3.
Specific Gravity : is 2.1 (well below average)
Streak: is white.
Associated Minerals: include hanksite, gaylussite, halite, pirssonite, northupite, nahcolite, borax and calcite.
Other Characteristics: Has an alkaline taste.
Best Field Indicators: environment of formation, color, cleavage, density, crystal habit, taste and locality.
Searles Lake, San Bernardino County, California
Borax Lake, Lake County, California
Owens Lake, Inyo County, California
Mono Lake, Mono County, California
Green River, Wyoming
Mont Saint-Hilaire, Quebec, Canada