Materials

Ivory is essentially teeth. Ivory usually refers to elephant's tusks, but any tooth large enough to be carved can be used as ivory. Before plastic was invented, ivory was commonly used for making ornaments, buttons, handles of knives and forks and the most familiar use - piano keys.
Today the trade in ivory is banned in most countries, and plastic or ivory substitutes are used where ivory was once used.

Jasper is an opaque silicate that can be virtually any color. It is often used for making jewelry. Some colours are more valuable than others - the jasper in the picture is red jasper.

A jewel is a cut and polished gemstone, either precious or semi-precious, that can be used to make jewelry. Another word for a jewel is a gem.

Lace is a kind of fabric that is made up of loops and holes. Lace usually has flower shapes in it, and is very pretty. It is often found on the edges of dresses.

Latex is the milky sap of many different plants. One tree in particular, the Para rubber tree, is used for commercially producing rubber.
Rubber is used in a huge variety of ways. It is used to make rubber bands, erasers, elastic that you find in the waistband of clothes, drive belts inside a car engine, gumboots and the biggest use is tyres.

Lead is a soft metal that is usually dull grey. It is the heaviest stable metal. It has a relatively low melting point.
Lead is used in batteries, bullets, solder, pewter and radiation shields.
Lead is a heavy metal like mercury and can accumulate in the body and cause poisoning. Lead poisoning was common in ancient times.

Limestone is a rock made up of calcium carbonate. It is formed by sediments at the bottom of the sea compressing over time into rock. The calcium carbonate in limestone comes from thousands and thousands of shells of sea creatures.
Limestone is an ingredient of mortar, cement and toothpaste. The stone itself can be carved into statues or cut into blocks to make buildings out of.

Lumber is wood that has been cut into regular shapes like planks or beams to be used for construction.

Magnesium is a highly reactive metal that is not found in its pure form. It is quite common, and is essential for life.
The pure metal burns bright white and is an ingredient in flares.

Malachite is copper carbonate, and is a bright green colour, often with bands and swirls of different shades of green. The patterning makes it quite attractive polished and can be used in jewelry.