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  2. Mineralogy of the Pikes Peak Region - Wikipedia

    en.wikipedia.org/wiki/Mineralogy_of_the_Pikes...

    Crystal Peak is one of the most famous mineral collecting localities in Colorado. Specimens from Crystal Peak are sometimes referred to as coming from Lake George or Florissant, but the actual collecting area is located near Crystal Peak. The area has produced some of the finest smoky quartz and amazonite specimens in the world.

  3. Pikes Peak granite - Wikipedia

    en.wikipedia.org/wiki/Pikes_Peak_granite

    Pikes Peak granite is a 1.08 billion year old Late-Precambrian geologic formation found in the central part of the Front Range of Colorado.It is a coarse-grained pink to light red syenogranite with minor gray monzogranite, and it has a distinctive brick-red appearance where it outcrops.

  4. Diorite - Wikipedia

    en.wikipedia.org/wiki/Diorite

    The name diorite (from Ancient Greek διορίζειν, "to distinguish") was first applied to the rock by René Just Haüy [10] on account of its characteristic, easily identifiable large crystals of hornblende. [4] Dioritoids form a family of rock types similar to diorite, such as monzodiorite, quartz diorite, or nepheline-bearing diorite ...

  5. Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite

    Quartz crystals with masses measured in thousands of pounds [5] and micas over 10 meters (33 ft) across and 4 meters (13 ft) thick have been found. [8] Spodumene crystals over 12 meters (40 ft) long have been found in the Black Hills of South Dakota, and beryl crystals 8.2 meters (27 ft) long and 1.8 meters (6 ft) in diameter have been found at ...

  6. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...

  7. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Litchfieldite – A metamorphosed nepheline syenite occurrence near Litchfield, Maine; Llanite – Type of mineral – A hypabyssal rhyolite with microcline and blue quartz phenocrysts from the Llano Uplift in Texas; Luxullianite – Rare type of granite; Mangerite – Plutonic intrusive igneous rock, that is essentially a hypersthene-bearing ...

  8. Herkimer diamond - Wikipedia

    en.wikipedia.org/wiki/Herkimer_diamond

    Inclusions can be found in these crystals that provide clues to the origins of the Herkimer diamonds. Found within the inclusions are solids, liquids (salt water or petroleum), gases (most often carbon dioxide), two- and three-phase inclusions, and negative (uniaxial) crystals. A black hydrocarbon is the most common solid inclusion.

  9. Yogo sapphire - Wikipedia

    en.wikipedia.org/wiki/Yogo_sapphire

    The rock has a porphyritic texture with large crystals of orthopyroxene and phlogopite set in a fine grained matrix. The phlogopite crystals have been used to determine the age of the dike and its crystallization temperature (900 °C (1,650 °F)). The dike also contains fragments of other rock types.

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