Scoria

Sulfur is the 10th most common element in the universe and it makes up almost 3 percent of the Earth's mass. In its crystal form, it's useless as a gem - it is extremely heat-sensitive that even the warmth of hands can cause it to crack. Sulfur deposits are found around fumaroles and volcanic areas.

Dendrite Rock can be any type of crystal rock that shows multi-branching markings that resemble trees. These patterns are actually iron or manganese oxide inclusions that can be found in a variety of stones, including agate, opal, or jasper. The term "dendrite" was derived from the Greek word "dendron," which means "tree."

Garnierite is a light to dark green layer silicate mineral. Garnierite is a term used to describe green, nickel-rich stones found in serpentines. Certain specimens can be cut, polished, and sculptured and used as a gem material, though the material in some localities can be quite brittle. Garnierite material is usually sold in the form of tumbled stones.

A stromatolite is not a specific type of rock, per se, but is rather a specific sedimentary formation. Stromatolites are created when adhesive compounds, generated by oceanic cyanobacteria, work to glue together many grains of sand or other small rocks, creating columns or pillow-like formations. Most stromatolites that we know about today are fossilized, having been formed by bacteria hundreds of millions of years ago.

Kunzite is a gemstone that gets its pink-violet color from trace amounts of manganese. The gem has growing popularity in high-end jewelry due to its size and clarity, However, it is a difficult stone to cut and has a tendency to cleave. Kunzite is used in the making of certain batteries, medicines, and ceramics.

A major constituent of the Earth's crust, plagioclase is a group of minerals that are frequently used in construction, architecture, and decoration. Some specimens exhibit optical phenomena which make them highly sought after as gems. Many of the rocks collected on the Moon are rich in plagioclase.

Limonite, a field-term utilized for unidentified massive hydroxides and oxides of iron, is recognized for its absence of visible crystals and its characteristic yellow-brown streak. It often exhibits a yellow-brown color and a dull earthy luster. Limonite is found in various locations around the world and is frequently associated with other iron-bearing minerals.

Opalized Fluorite is a rock predominantly composed of fluorite complemented by opal, calcite, dolomite, quartz, chalcedony, and other minerals. The most prized variety, Tiffany Stone, is a rare purple, blue, and white gem mined exclusively at the Brush Wellman beryllium mine in Spor Mountain, western Utah. In recent times, there has been a significant influx of less expensive materials from China and Turkey into the market, frequently leading to confusion and misidentification with Tiffany Stone.