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Geology of States

Rockhounding in Colorado – What Rocks You Can Find and Where

ByCeleste February 9, 2021February 9, 2021

Upcoming Rockhounding Events in Colorado

[tribe_events_list tags=”colorado”]

Marble

Marble forms when limestone or dolomite is subjected to heat and pressure caused by thick layers of overlying sediment. This metamorphism can result in impurities in the limestone recrystallizing and forming mineral impurities that impact the texture and color of the marble. Desirable, pure-white marble is formed by very pure, silicate-poor limestone or dolomite.

Marble is an economically valuable rock. It is used in everything from fine arts to construction aggregate. Different locations produce marbles of varying quality or color that can be used for different purposes.

Marble is in the Public Domain

Smoky Quartz

Streak: White

Hardness: 7

Chemical Formula: SiO2

Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystal. Like other quartz gems, it is a silicon dioxide crystal. The smoky color results from free silicon formed from the silicon dioxide by natural irradiation.

Rhodochrosite

Streak: White

Hardness: 3.5 – 4

Chemical Formula: MnCO3

Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO3. In its (rare) pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown. It streaks white, and its Mohs hardness varies between 3.5 and 4. Its specific gravity is between 3.5 and 3.7. It crystallizes in the trigonal system, and cleaves with rhombohedral carbonate cleavage in three directions. Crystal twinning often is present.

Rhodochrosite occurs as a hydrothermal vein mineral along with other manganese minerals in low temperature ore deposits as in the silver mines of Romania where it was first found. Banded rhodochrosite is mined in Capillitas, Argentina.

It was first described in 1813 in reference to a sample from Cavnic, Maramureş, present-day Romania.

Photo: Fluorite Quartz Rhodochrosite by Robert M. Lavinsky is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.

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    • 2017 03 08 Mines Shoot 8620 JDN 768x512

    Colorado School of Mines Geology Museum

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    : 1:00 pm - 4:00 pm
    Mon
    9:00 am - 4:00 pm
    Tue
    9:00 am - 4:00 pm
    Wed
    9:00 am - 4:00 pm
    Thu
    9:00 am - 4:00 pm
    Fri
    9:00 am - 4:00 pm
    Sat
    1:00 pm - 4:00 pm
    Sun
    1:00 pm - 4:00 pm
    The Colorado School of Mines Geology Museum offers a wide verity of geology attractions, from moon rocks to the Miss Colorado Crown which consists of over 600 gemstones and 21 diamonds. The museum has over 60,000 items in it’s collection and rotates them often so there is always something new to see. Read more...
    • florissant fossil quarry 768x432

    Florissant Fossil Quarry

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    The Fossil Digging Experience The Florissant Fossil Quarry is located in the small Colorado mountain town of Florissant which lies in the shadow of Pike’s Peak. Our family friendly fossil digging quarry is essentially a large shale bed. Many millions of years ago, volcanic ash trapped layers of living animals and plants in the shale. The shale is easy to Read more...
    • garden of the gods

    Garden of the Gods

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    Explore Colorado Springs’ paradise in one magical stop. Garden of the Gods Park is a registered National Natural Landmark. Imagine dramatic views, 300′ towering sandstone rock formations against a backdrop of snow-capped Pikes Peak and brilliant blue skies. This world-class Visitor & Nature Center and museum is the most visited attraction in the region with all new interactive exhibits. Learn Read more...
    • Marshall Pass 768x288

    Marshall Pass

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    Along the old abandoned railroad grade of Marshall Pass you can find jasper, marble, geodes, picture sandstone, rhyolite, and fossils. Read more...
    • national mining hall of fame 768x576

    National Mining Hall of Fame

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    The National Mining Hall of Fame holds more than 250 stories of men and women who achieved lasting greatness in mining and natural resources. Browse it to learn of these and other fascinating stories: Also included are plaques for honorees of the Pit & Quarry Hall of Fame, established in 2013 to pay tribute to the pioneers of the past Read more...
Celeste
Author: Celeste

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