While its mineral name is halite, this substance is also commonly known as rock salt. Rock salt is composed of sodium chloride, an essential compound the human body uses to absorb nutrients and maintain blood pressure.

Olivine is a mineral with a distinct green color and granular-shaped crystals. It is one of the first minerals to cool and crystallize from magma. Recently, olivine has been used as an alternative to silica sand and…

Calcite is one of the most widely used minerals. It is primarily composed of the chemical compound calcium carbonate. Calcite is also often used in demonstrations of double refraction, in which light is split into two…

Fluorite (also called fluorspar) is the crystal form of the inorganic compound calcium fluoride. The term "fluorescence," a type of luminescence by a substance that has absorbed light or radiation, is derived from this…

Barium (atomic symbol Ba) is an alkaline Earth metal. Barite (also spelled baryte) is a mineral composed of barium sulfate. It is used in paints, inks, paper, and rubber. It is also used in radiology for diagnostic…

Boron (atomic symbol B), a naturally occuring Earth element, was first isolated by Sir Humphry Davy and Joseph Louis Gay-Lussac and Louis Jacques Thénard in 1808. Tourmaline is a boron silicate. Opaque and black in…

Amazonite is a potassium-based blue-green variety of microcline feldspar. Its color may be an indication of the presence of iron or lead. Amazonite has been used as a decorative gemstone in statues and jewelry.

Celestine is a mineral with a light blue color. It is a source of the element strontium (atomic symbol Sr). Strontium compounds are commonly used in fireworks, fluorescent lights, and dyes and paints.

The instrument is here shown attached to its power supply on a laboratory bench. The people in this image are unidentified.

The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the company was…

Iron gas burner for the production of small glassworks; ball and socket rotatable neck; two flame adjustment knobs; three-pronged foot. Adjusting the two knobs on the burner allows for the user to dial in the exact…

Meeker burners function the exact same way as Bunsen burners except that they are used for objects that require a wider flame base. The Meeker burner can produce more heat than a Bunsen burner and features a distinctive…

Collection of 13 Aramith Bakelite billiard balls. Some billiard numbers are missing or duplicated.

Green cardboard box with removable top; interior of box bottom has a white plastic insert with round indentations for…