Plate from Françoise Louis Swebach Desfontaines' 'Histoire naturelle' (1789). Natural History Museum, London
Malachite - $200 LEtoile du Congo Mine, Lubumbashi, Katanga Copper Crescent, Democratic Republic of the Congo
Malachite with (originally: http://www.crystalarium.com/single-page.php?pid=7733296&cat=minerals-s18, now 404)
Smithsonian Institute Global Volcanism Program
V některých částech dolu se stále ještě těží. Foto, ilustrace: Profimedia
Quartz with blue fluorite inclusions.
Ethiopian kryptonite (opal) | via Jeff Schultz on Flickr
Gallium: A metal with a melting point of a little over 27 degrees centigrade. Meaning it melts from solid state to liquid state in your hand
Fire Opal in matrix, Mexico | via Jeff Schultz on Flickr
Helpful gem chart
Amethyst Crystal Ball
Veszelyite. One of the minerals called phosphates. All phosphates have the phosphate group, PO4, in their chemical composition. Many phosphates form from the chemical alteration of other minerals in the presence of oxygen. Group: Phosphates. Image Number: 97-35129. Catalog Number: 148368. M. Stuart
Smithsonite. The mineral was named after James Smithson, the British chemist and mineralogist who first recognized it as a distinct mineral, different from calamine(hemimorphite). It is mined for zinc. James Smithson (1754-1829) was the founder of the Smithsonian Institution. Group: Carbonates, Image Number: MSA 62
Liddicoatite. Slice from a single crystal of liddicoatite. The colour-zoning reveal the crystal's history, just as the rings in a tree records its past. Crystals may start and stop growing many times. In most cases, there is no way of knowing how long each phase lasted. This particular crystal changed color as it grew. The pink portion of the liddicoatite formed when the solution feeding it was manganese rich. The green part grew when the solution became iron rich.
Rare Nipomo marcasite in agate, from California.
Ethiopian Welo opal beads, about 100 carats. The largest beads are about 10 mm diameter. | via James Picht on Flickr
Lapis Lazuli & Pyrite | via Maryanne Fender on Flickr
Azurite & Malachite Cabochon | via Maryanne Fender on Flickr