haruldushard
Haruldushard is a rare naturally occurring mineral noted for exceptional hardness and thermal stability. It forms under extreme high-pressure, high-temperature conditions in subduction-zone settings and is typically found as elongated prismatic crystals within ultramafic rocks. The name derives from haruldu, a constructed term intended to evoke hardness, combined with shard to reflect its crystalline habit.
In terms of physical properties, haruldushard has a Mohs hardness of 9.0 to 9.5, a metallic luster,
Geologically, haruldushard is found in trace amounts in high-grade metamorphic belts and ultramafic intrusions associated with
Discovery and use: The mineral was first described in a 22nd-century minerals survey focusing on subduction-zone