What gems can be found in Illinois?

State Symbols
State Mineral Fluorite
State Rock
State Gemstone
State Fossil Tully Monster

Where can I find geodes in Illinois?

In Illinois, geodes can be found most easy in the Warsaw Formation in the area of Nauvoo, Hamilton, and Warsaw.

What crystals are found in Illinois?

Calcite crystals are found in Illinois as linings in geodes, especially in the Nauvoo-Hamilton-Warsaw area. Thin calcite veins occur along joints in coal beds and vugs within limestone and dolomite. Small amounts of clear crystalline calcite are associated with various ores in northwestern and southern Illinois.

Can you find amethyst in Illinois?

Illinois designated fluorite as its official state mineral in 1965. … Fluorite, however, can show many different colors depending on tiny amounts of other elements taking the place of the calcium in the molecular structure (colors include deep purple, amethyst, sky blue, sea green, sunny yellow, & crystal clear).

Can geodes be found in Illinois?

Geodes found in Illinois range from less than 1 inch to more than 2 feet in diameter, but 3 to 5 inches is the average. … Although geodes can be found in carbonate-rich rocks throughout the state, one of the most famous geode collecting areas in the country is in western Illinois and adjacent parts of Iowa and Missouri.

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Are geodes valuable?

According to Answers.com, the value of a geode “… … Large amethyst geodes can go for thousands. Baseball sized geodes with non-spectacular quartz or calcite crystals can be purchased for $4-$12. Geodes with uncommon minerals that are sold on mineral auction sites range in price from $30-$500.

Can you find obsidian in Illinois?

In Illinois, obsidian rarely found in mounds.

Is there gold in Illinois?

Gold: Its Occurrence in Illinois. Gold is not known to occur in minable deposits anywhere in Illinois, so prospecting essentially refers to recreational panning. Gold has never been mined in Illinois, not even as a by-product of other types of mining such as fluorite, zinc-lead, or sand and gravel.

Is Obsidian a real thing?

obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. … Obsidian is extremely rich in silica (about 65 to 80 percent), is low in water, and has a chemical composition similar to rhyolite.

Can you find crystals in Illinois?

Crystals are generally clear or light shades, but some brilliant crystals have also been found in Illinois. The southeastern region of Illinois has been known to have enormous fluorite rich deposits especially occurring in veins of limestone rock formations.

Is there quartz in Illinois?

There are two main types of quartz: (1) crystalline quartz and (2) dense, microcrystalline to cryptocrystalline (microscopic to submicroscopic) quartz. … Many dense varieties occur in Illinois; the most common is chert.

How do I know where to dig for crystals?

To locate a vein you will want to look for evidence of quartz and/or crystals on ground rock, outcrops, bluffs, ridges, and ridge-sides. If you find evidence of Quartz Crystals on the ground, you will want to dig “test holes” of about 2’x2’x2′ to see if you can find the veins.

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Where can I mine for fluorite in Illinois?

In Illinois, fluorite was mined almost exclusively in Hardin and Pope Counties. The main production came from fissure-vein deposits in the Rosiclare district, and stratiform (bedding plane) deposits in the Cave in Rock district (see map below). Other areas in the two counties yielded smaller amounts of the mineral.

How can you tell a rock from a geode?

Tell-Tale Signs of a Geode

  1. Geodes are usually spherical, but they always have a bumpy surface.
  2. Geodes will sometimes have loose material inside, which can be heard when shaking the rock. …
  3. Geodes are usually lighter than their size would indicate since the interior doesn’t contain any material.

Where can I hunt geodes?

California, Utah, Nevada, Iowa, and Arizona are all known for their geodes, but you can find geodes in most other states as well. Uruguay, Brazil, and Mexico are also known for having geodes, and Madagascar has a specific type called the celestite geode.

How old are small geodes?

Although the geode is embedded in rocks that are about 250 million years old, the crystals themselves are much younger than that. Radioactive dating of some of the oldest suggests they formed less than 5.6 million years ago but probably no more than 2 million years ago, the researchers report this week in Geology .

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