View Single Post
Old 17-11-2012, 01:32 AM   #326
Senior Member
Join Date: Apr 2008
Location: Inactive
Posts: 36,483
Likes: 237 (190 Posts)
Lightbulb Egg & Spooner

Calcite crystals line the inside of a dinosaur eggs,such hollow eggs are rare because the weight of sediments ...Calcite was first recognized as a constituent in dinosaur eggs in 1923, and in these and other fossils it is normally re-crystallized...High-grade optical calcite was used in World War II for gun sights, specifically in bomb sights and anti-aircraft weaponry. Also, experiments have been conducted to use calcite for a cloak of invisibility...Calcite seas alternated with aragonite seas over the Phanerozoic, being most prominent in the Ordovician and Jurassic...The Ordovician, named after the Celtic tribe of the Ordovices...The chronostratigraphic term "Jurassic" is directly linked to the Jura Mountains...
If you go down to Koekohe beach in New Zealand you can be sure of a big surprise. In front of you, scattered like enormous marbles from some long abandoned game between giants, are hundreds of giant spherical rocks. Or are they the egg shells of sea-born dragons? The Moeraki boulders present us with a mystery – what are they and how on earth did they get there? Many of the Moeraki boulders give the impression of being completely spherical – and they almost are. They are septarian concretions – a sedimentary rock that has had the space between its individual grains filled up by minerals which acted like cement. Concretions form inside the layers of mud and clay and are not, as some think, boulders buried over time.What is significant about these concretions is their size. They are big. While not unique on the planet, some of them are up to a meter in diameter but the majority range from 1.5 to 2.2 meters – that is almost seven feet in diameter. Most of them are almost perfect spheres...The material responsible for their concretion is a carbonate mineral called calcite. In the center the concretion is sometimes quite weak (perhaps the opposite we might expect) but the exterior is usually the hardest part being made up of sometimes 20% calcite. Not only has the calcite concreted the boulder’s clay and silt – it has replaced a lot of it too...

The full Māori name for the island is 'Te Puia o Whakaari', meaning 'The Dramatic Volcano.' It was named 'White Island' by Captain Cook on October 1, 1769 because it always appeared to be in a cloud of white steam. Although Cook went close to the island he failed to notice that it was a volcano. Its official name is Whakaari/White Island although it is best known as White Island. Attempts were made in the mid 1880s, 1898–1901 and 1913-1914 to mine sulphur from White Island but the last of these came to a halt in September 1914, when part of the western crater rim collapsed, creating a lahar which killed all 10 workers. They disappeared without trace, and only a camp cat survived. Some years later in 1923 mining was again attempted, but learning from the 1914 disaster, the miners built their huts on a flat part of the island near a gannet colony.

In May 2004 a Dino figurine was glued to a rock in front of the Geonet volcano camera on the island. Geonet decided not to have it removed, assuming it was a plastic toy and would not survive long in the corrosive environment. As of February 6, 2011, the figurine was still present and did not appear visibly degraded. Sometime between July 23 and July 24 2009, the Dino figure was moved to another location on camera...

Introduction to the Study of Dinosaurs...
lightgiver is offline   Reply With Quote