Galena has a silver color with a dark-gray streak. Galena has a hardness of 2.5 and a very heavy weight.2 Sept 2019
What kind of rocks is silver found in?
What rocks is silver found in? The ores of silver occur in veins traversing granitic and gneissic rocks, clay slate, mica schist, limestone, and are usually associated with the ores of iron, copper, load (galena being always argentiferous), zinc.29 Nov 2021
What mineral is metallic and shiny?
Minerals that are opaque and shiny, such as pyrite, have a metallic luster. Minerals such as quartz have a non-metallic luster. Luster is how the surface of a mineral reflects light.
What rocks have a metallic luster?
Gold, silver, and copper have metallic luster. Other minerals have a metallic luster as well.
What is a shiny mineral?
A mineral with a metallic luster is either shiny, because it reflects light like a polished piece of metal, or is dull- looking, because it reflects light like a metal rust or a metal tarnish. All other minerals that do not reflect light like some form of metal are said to be non- metallic.
What mineral is silver?
The most important ore mineral of silver is argentite (Ag2S, silver sulfide). Silver is commonly extracted from ore by smelting or chemical leaching.
What mineral has a shiny luster?
Minerals with metallic luster look shiny like metals. Gold, silver, and copper have metallic luster.
What type of rock is shiny and glossy?
Igneous rocks are formed when magma (molten rock deep within the earth) cools and hardens. Sometimes the magma cools inside the earth, and other times it erupts onto the surface from volcanoes (in this case, it is called lava). When lava cools very quickly, no crystals form and the rock looks shiny and glasslike.
What type of rock looks glassy?
obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Obsidian is extremely rich in silica (about 65 to 80 percent), is low in water, and has a chemical composition similar to rhyolite. Obsidian has a glassy lustre and is slightly harder than window glass.
What rock is smooth and glassy?
obsidian
What rock is very shiny?
Schist is a metamorphic rock that contains flakes of mica. Schist can originate as a sedimentary rock or igneous rock. Large crystals cause schist rocks to reflect lots of light which gives it a very shiny appearance. It is made up of clay minerals.
How do I find out what kind of rock I have?
- Your state geological survey.
- A natural science museum.
- A college or university with a geology department.
- A rockshop.
- Members of a local Gem & Mineral club or Rockhunting club (many hobbyists are experts at identification)
- Vendors at a Gem & Mineral show.
How can you identify an unknown rock?
Grain Size: Coarse grains are visible to the naked eye, and the minerals can usually be identified without using a magnifier. Fine grains are smaller and usually cannot be identified without using a magnifier. Hardness: This is measured with the Mohs scale and refers to the minerals contained within a rock.24 Feb 2020
What are 5 ways to identify a rock?
- Hardness. The ability to resist being scratched—or hardness—is one of the most useful properties for identifying minerals.
- Luster. Luster is how a mineral reflects light.
- Color. One of the most obvious properties of a mineral is color.
- Streak.
- Specific Gravity.