There is not enough information to go on. Many minerals fit this description, especially since there are several types of nonmetallic luster.
Magnatite is the mineral that has a nonmatallic luster, is black, and can be scratched by a fingernail.
The mineral you are referring to is likely magnetite. Magnetite is a black mineral with a nonmetallic luster, often appearing metallic or glassy. It is a common iron oxide mineral found in a variety of geological settings.
Depending on the variety, feldspars can range from adamantine to glassy in luster.
That could be graphite, which is a natural allotrope of the element carbon.
True. The luster of a mineral is described as either metallic or nonmetallic. Metallic luster reflects light like metal, while nonmetallic luster can vary from glassy to earthy in appearance.
If a mineral has a shiny luster, is it matallicIf a mineral has no shiny luster, is it nonmetallic?
The Luster of a mineral is it's appearance in the light. Also there are two types of Luster, metallic and nonmetallic.
luster is used to determine if a mineral has metallic or nonmetallic shine. It also means the way a mineral reflects light
yes
The mineral that fits these descriptions is obsidian. Obsidian is a natural volcanic glass that can scratch glass, has a nonmetallic luster, typically exhibits conchoidal fracture, and is usually a dark color, such as black, dark green, or dark brown.
Luster. It describes how a mineral reflects light and can be used to distinguish different minerals based on their appearance. Minerals with a metallic luster appear shiny like metal, those with a submetallic luster are somewhat shiny, and those with a nonmetallic luster do not appear shiny.
The mineral that is nonmetallic and has a silky luster is serpentine. Serpentine is a group of minerals that are typically green in color and have a silky or waxy sheen on its surface. It is commonly found in metamorphic rocks.