Quartz, monkeys look cool and im a ranga
Either iron pyrites, FeS; or gold-coloured mica.
Iron Pyrites is a naturally occurring mineral that is often mistaken for gold. Many "fools" have thought they stuck it rich only to find out that their "gold" was actually worthless.
Salt, iron pots and pans, gypsum (in the drywall or plaster), and quartz (in the glasses).
Pure quartz is a colorless mineral, and so a pure quartz sandstone will appear white due to multiple reflections and refractions between grains. However, impurities in the sandstone may give it some other color. What color it turns out as depends on the impurities. For example, iron oxide will produce a red sandstone.
Iron is much denser than a feather. Yet, a particular sample of feathers weighs more than a sample of iron.
Either iron pyrites, FeS; or gold-coloured mica.
iron pyrites
No one 'made' it. It is a mineral called iron pyrites, which looks similar to gold in ore.
What is iron pyrites?
Yes it is a mineral. SiO2 in composition. Commonly it can be coloured by trace elements such as iron.
Amethyst is the purple variety of quartz. Quartz is Silicon Dioxide SiO2. The color comes from trace elements of manganese/Iron Oxide Fe2O3. To get the best color and best uniform color amethyst is heated.
Fool's gold is iron pyrites, iron sulphide, FeS2. It is a sulphide mineral.
Rose quartz is formed when a small amount of iron is incorporated into a pure quartz (SiO2) matrix. The inclusion of iron (Fe2O3) in many minerals s responsible for the colors that are observed. Iron also turns quartz into Amethyst.
Lustre is one name, and specular would be another. Fools gold (iron pyrites) demonstrates this sufficiently as to deceive the ignorant.
Iron Pyrites - Iron Sulfide
Fool's Gold should be (Iron) Pyrite and chemically is a crystalline form of iron disulfide, FeS2. Other pyrites, such as chalcopyrite, are other variations of iron sulfide, such as FeS or Fe2S3. Regardless, most pyrites contain some amounts of other metals, like nickel or cobalt, which can minutely alter the color and crystalline structure.
Iron pyrites is commonly called "fools gold" since it is often mistaken for gold by people who do not know how to tell the difference.