native copper and galena, develop a dull coating or tarnish when exposed to the atmosphere. Because they are not as shiny as samples with freshly broken surfaces, these samples are often said to exhibit a submetallic luster.
Most minerals have a nonmetallic luster and are described using various adjectives such as vitreous(glassy), dull or earthy(a dull appearance like soil), pearly(such as a pearl or the inside of a clamshell), silky(like satin cloth), or greasy(as though coated in oil).
The Ability to Transmit Light Another optical property used in the identification of minerals is the ability to transmit light. When no light is transmitted, the mineral is described as opaque, when light but not an image is transmitted through a mineral, it is said to be translucent. When both light and an image are visible through the sample, the mineral is described as transparent.
native copper and galena, develop a dull coating or tarnish when exposed to the atmosphere. Because they are not as shiny as samples with freshly broken surfaces, these samples are often said to exhibit a submetallic luster.Most minerals have a nonmetallic luster and are described using various adjectives such as vitreous(glassy), dull or earthy(a dull appearance like soil), pearly(such as a pearl or the inside of a clamshell), silky(like satin cloth), or greasy(as though coated in oil).The Ability to Transmit Light Another optical property used in the identification of minerals is the ability to transmit light. When no light is transmitted, the mineral is described as opaque, when light but not an image is transmitted through a mineral, it is said to be translucent. When both light and an image are visible through the sample, the mineral is described as transparent.
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