Mineralogy classified into density (often given as specific gravity); measures of mechanical cohesion (hardness, tenacity, cleavage, fracture, parting); macroscopic visual properties (luster, color, streak, luminescence, diaphaneity); magnetic and electric properties; radioactivity and solubility in hydrogen chloride (). "Hardness" is determined by comparison with other minerals. In the Mohs scale, a standard set of minerals are numbered in order of increasing hardness from 1 (talc) to 10 (diamond). A harder mineral will scratch a softer, so an unknown mineral can be placed in this scale by which minerals it scratches and which scratch it. A few minerals such as calcite and kyanite
Softer, Softest the song developed into its final form in early 1993 when the name "Softer, Softest" was being used. The first known studio version of "Softer, Softest" was recorded on 21 January 1993 at BMG Ariola Ltda in Rio de Janeiro, Brazil. Featuring Love on lead guitar and vocals, recently recruited drummer Patty Schemel and Love's husband Kurt Cobain of Nirvana on bass, the trio recorded the song, alongside "I Think That I Would Die" (then known as "Baby") "She Walks on Me", "Miss World" and "Closing Time", during breaks in Nirvana's session. Sound engineer Craig Montgomery stated that the songs