Mohs' scale of mineral hardness is named after Friedrich Mohs, a mineralogist.Mohs scale is ordered by hardness, determined by which minerals can scratch other minerals.. Specific Gravity is variable according to purity 10-12 (well above average even for metallic minerals) Associated Minerals are silver minerals such as acanthite and prousite , cobaltite , copper , zeolites and quartz . Hardness 5-5.5. Bromargyrite and Chlorargyrite can be visually indistinguishable from one another, and will often form in the same deposits. Silver - A good combination specimen with a 1cm area of wire Silver (with Acanthite overgrowth) associated with deep red Sphalerite, Galena and Siderite. Its hardness parallel to the length of the crystal is 5½ while perpendicular to the length the hardness is 7. If your mineral scrapes the copper penny, continue to scrape a steel blade. Cleavage none. The mineral mica breaks evenly along flat sheets mainly because of its 1. atomic arrangement 2. chemical composition 3. hardness 4. density There are natural and synthetic diamonds. Silver’s physical and chemical properties are intermediate between those of copper and gold. Silver This mineral is used in jewelry, tableware, coins, scientific equipment and in photographic processes. What is a Rock What is a Mineral; Mineral Properties; Color; Streak; Hardness; Specific Gravity; Luster; Cleavage, Fracture; Tenacity; Chemical Properties of Minerals; Birthstones; Top 5 Tips for Diamond Buying; Trends in Mineral Collecting; All Research Topics; QA. The Moh’s Scale of Hardness. Silver often occurs near copper lodes. Minerals of the same hardness can scratch each other. With diamonds, the octahedral surface is the hardest and without differences in directional hardness a diamond could not be cut. Substance or Mineral Hardness; ... Silver 2,7 Jet 2,5 - 3,5 Gold 2,5 - 3 Copper 2,5 - 3 Zinc 2,5 Seafoam 2 - 2,5 Amber 2 - 2,5 Ivory 2 - 3 Alabaster 2 Tin 1,8 Horn 1,5 - 2,5 Any stone that scratches porcelain instead of leaving a streak has a hardness of about 6.5 Mohs. Silver tarnishes after exposure to air (a thin layer of silver-oxide forms on the surface). It is located in Group 11 of the periodic table. Cubic cleavage. 2007 Schools Wikipedia Selection.Related subjects: Mineralogy Mohs' scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It is a common member of the amphibole group. If your mineral does NOT scrape the penny, record the hardness as 2.5