The set weighs 22 lbs. 11 oz.
Petrified Wood is a type of a fossil as it consists of fossil wood where all the organic materials have been replaced with minerals while retaining the original structure of the wood. These minerals are most often Silicates such as Quartz. Other minerals, Manganese, Iron and Copper, in the water or mud during the petrification process gives Petrified Wood a variety of color ranges: black - Carbon; green/blue - Copper; red/brown/yellow - Iron. Petrified Wood can preserve the original structure of the wood in all its detail all the way down to the microscopic level. Structures such as tree rings and the various tissues are often observed features. Although Petrified Wood can be found worldwide, it is rather rare in larger quantities and at times can be difficult to obtain by the average collector.
$350.00
Dugway Geode Bookends
Total weight is 6 lb. 1 oz.
Geodes are geological rock formations which occur in sedimentary and certain volcanic rocks. They are essentially rock cavities or vugs with internal Crystal formations or concentric banding. The exterior is generally Limestone while the interior contains Quartz Crystals and/or Chalcedony deposits. If the Geode is completely filled with Crystal, being solid all the way through, it is then called a nodule.
$125.00
Silver Ore - Pyrite Bookends
Total weight is 7 lb. 1 oz.
Pyrite, or Iron Pyrite, is an Iron sulfide with isometric Crystals that usually appear as cubes. It is brittle and can break or powder easily. Its metallic luster and brass yellow hue have earned it the nickname of "fool's gold" due to many miners mistaken it for the real thing. Ironically, small quantities of actual gold are sometimes found in Pyrite. It is the most common of the sulfide minerals and is usually found with other sulfides or oxides in Quartz veins, sedimentary or metamorphic rocks.
$85.00
Brazilian Agate Bookends
Total weight 9 lbs. 7 oz.
Agates mostly occur as nodules in volcanic rocks or waters containing silica in solution possibly derived from the decomposition of silicates in the lava. The siliceous matter is deposited in regular layers resulting in the banded or striped formation.
$70.00
Onyx Bookends
Total weight is 8 lbs. 5.7 oz.
Onyx is a banded variety of Calcite. The colors of its bands range from white to almost every color except shades of purple, blue and black. It is used for vases, bowls, beads, cabochons and other items. This type is found in Mexico and Pakistan and is often carved and polished into various items. This material is much more readily available and softer than the gemstone commonly called Black Onyx which is a silica gem.
$60.00
Brazilian Agate Bookends
This set weighs 11 lbs. 13 oz.
Agates mostly occur as nodules in volcanic rocks or waters containing silica in solution possibly derived from the decomposition of silicates in the lava. The siliceous matter is deposited in regular layers resulting in the banded or striped formation.
Bird's Eye Rhyolite Bookends
This set weighs 7 lbs. 8 oz.
Rhyolite is an igneous, volcanic rock that is composed of Felsic, or Silicate minerals such as Silica, Aluminum, Sodium and Potassium. This material, also called Volcanic Tuft and Rainbow Rock actually began as volcanic ash spewed from the mouth of a volcano millions of years ago. This ash was exposed to heat and pressure that resulted in turning it to stone. The bright banded colors are a result of exposure to high concentrations of iron oxides. The material is similar to that of Granite, Pumice and Obsidian but due to the cooling process when formed, Rhyolite did not form any crystals, thus changing the texture of the material.
$75.00
Septarian Bookends
The set weighs 9 lbs. 8 oz.
Septarians are commonly composed of a carbonate mineral such as Calcite, a microcrystalline form of Silica as in Flint or Jasper, or an Iron Oxide such as Hematite. These specimens are also known as a concretion which is a type of sedimentary rock. Septarians were formed millions of years ago by sediment forming around a fossil to create a mud ball transforming the fossil into Calcite and Aragonite.
$225.00
Brazilian Agate Bookends
Total weight 7 lbs. 15 oz.
Agates mostly occur as nodules in volcanic rocks or waters containing silica in solution possibly derived from the decomposition of silicates in the lava. The siliceous matter is deposited in regular layers resulting in the banded or striped formation.
$70.00
The set weighs 7 lbs. 2 oz.
Orthoceras is
a genus of extinct Nautiloid Cephalopod. These fossils are common and
have a global distribution which occur in any marine rock, especially Limestone.
These are slender, elongated shells with the middle of the body chamber transversely
constricted and a sub-central orthochoanitic siphuncle. The surface is
ornamented by a network of fine lirae or fine lines/ridges.
$42.00
Brazilian Agate Bookends
Total weight is 4 lbs. 1 oz.
Agates mostly occur as nodules in volcanic rocks or waters containing silica in solution possibly derived from the decomposition of silicates in the lava. The siliceous matter is deposited in regular layers resulting in the banded or striped formation.
$35.00
