Hardness: Prehnite has a hardness ranging from 6 to 6
The colors typically form intricate patterns
Density: The density of obsidian varies depending on its composition and the presence of impurities
agate has a density ranging from about 2
Topaz - Brazil - 10 pounds Sunstone Hardness: Prehnite has a hardnessLocality: Brazil Mostly Small Pieces Color: Topaz occurs in a wide range of colors, including yellow, brown, orange, pink, red, purple, and blue. Topaz from Brazil mostly ranges in the yellow, brown, and some blue. Hardness: Topaz is a relatively hard gemstone, ranking 8 on the Mohs scale of mineral hardness. This makes it suitable for everyday wear in jewelry. Clarity: Topaz can vary in clarity, with some specimens being completely transparent and