Although it appears in many different colors, it is probably cassiterite, SnO2, the main ore of tin.
From Wikipedia: " Tin is obtained chiefly from the mineral cassiterite, where it occurs as an oxide....Tin's chemical properties fall between those of metals and non-metals, just as the semiconductors silicon and germanium do. Tin has two allotropes at normal pressure and temperature: gray tin and white tin. A third allotrope, called brittle tin, exists at temperatures above 161 °C. Below 13.2 °C, it exists as gray or alpha tin, which has a cubic crystal structure similar to silicon and germanium. Gray tin has no metallic properties at all, is a dull-gray powdery material, and has few uses, other than a few specialized semiconductor applications." although cassiterite ( an oxide) is the most common source of tin, occaisionally tin is sourced from sulfides such as stannite, a grey mineral with a metallic lustre.
The mineral that leaves a grey streak and is metallic is likely hematite. Hematite is a common iron oxide mineral that has a metallic luster and leaves a grey streak when scratched against a rough surface like unglazed porcelain.
Hematite is a common oxide mineral. It is composed of iron oxide and is often found as a black, grey, or reddish-brown mineral with a metallic luster. Hematite is an important source of iron ore and is widely distributed in various geological environments.
Silicon is a chemical element with symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic lustre. It is a semiconductor, widely used in electronics and solar technology.
No, famously, graphite is a dull grey colour. And copper salts are generally green or blue in colour. It all depends on the mineral. The colour of a mineral is one of its several distinctive characteristics, others are hardness, its density, its cleavage, its lustre, and so on. Each of these are of aid in mineral identification.
Stibnite is a dark gray or silvery mineral with a metallic luster, but it can also appear black due to its high lead content. The color may vary depending on impurities in the mineral or the angle it is viewed from.
An antimonite is a grey mineral, antimony sulphide, which is the main source of antimony, or any of a variety of oxyanions of antimony such as H2SbO3-.
The BMW M3 E46 was available in 13 colours. The colours were white, red, black, blue, black metallic, sapphire metallic, silver metallic, steel grey metallic, silver grey metallic, topaz blue metallic, mystic blue metallic, interlagos blue metallic, Oxford green metallic and yellow metallic.
The description matches that of a type of rock called hematite. Hematite is a heavy, shiny grey mineral that is commonly found in nature. It has a metallic luster and a high density, making it feel heavy in the hand.
Pyrite typically appears as a brassy yellow color, often with a metallic sheen. It may also have hints of gold, silver, and grey tones, depending on impurities present in the mineral.
Arsenic has a metallic grey aspect.
Arsenic has a metallic grey aspect.