Sometimes she wears lace, other times she plays the role of onions. Its appearance depends on the ranges and variety to which it belongs. It is garnet, a semi-precious mineral that has a “fingerprint,” like the visual interaction created by the colors and transparency inside.
Being a skillful mixture of gas and steam bubbles (emitted as lava solidifies) and silicon-rich water, the interior of agate hides a magical formation of quartz and chalcedony, which is what gives it its distinctive and revered aesthetic properties. Stripes or stripes of different colors create geometric and semi-pearl shapes.
(Read also: Earth’s minerals: a mineral that blooms in the desert)
Hence, the skillful fusion of white concentric bands with brown stripes, black and gray, gives life to crazy lace, a variety of opal that evokes the subtle shapes of thread lace; While the belt known as “wall cladding” features strips perpendicular to the direction of the stone fibers and follows a concentric pattern, it creates structures similar to those of onions.
“The second band, called ‘horizontal bands’, is less frequent and consists of thin layers of small balls of chalcedony and quartz crystals,” explains Issue 19 of the Earth Minerals Group, which will be published this week with EL TIEMPO, with the garnet crust sparkling.
Likewise, this new edition takes the reader on a trip to the Science Center, as it presents a complete presentation of the physical properties of minerals (habit, hardness, scratch, color, flaking, luster, etc.) and electrical and magnetic properties that answer common concerns among rock lovers, Like why some stones when collide with each other generate sparks or even, if it is true that talc is the softest mineral on the known Mohs scale of hardness.
(We recommend: Earth Minerals: Between Lava and Ice)
Finally, this tour ends at Orcko, a fossil site formed in a Bolivian quarry that contains about ten thousand footprints of about 15 different species of dinosaur immortalized by volcanic ash that flew after a nearby volcanic eruption. Accumulation of water-borne sedimentary material transformed this terrain into rocks that reveal some of the evolutionary steps of the Cretaceous period.
Earth minerals. The onyx (plate) and legitimate rock specimen will arrive Thursday at a cost of 28,900 pesos (including pamphlet and stone).
Those interested in getting the full set at 1,383,900 pesos for subscribers, and 1,615,000 pesos for non-subscribers, can do so through store.eltiempo.com/mineralesdelatierra or by calling Bogotá at 4 26 6000, option 3, and at Toll-free national line 018000110990.
Find also in science