BETA

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  1. Blue Mountain Granite

    ... of quartz , feldspar , biotite , garnet, opaques, amphibole s, and pyroxene s. Quartz and feldspar account for about 70 ... and has a maximum crystal size of 2.8 mm. Various species of amphibole, including hornblende are the next most common accessory mineral. ...

    Ed FitzGerald - 2015-09-04

  2. Sierra Rose

    ... biotite at about 10 percent of slide area. A green-brown amphibole , likely hornblende , is also relatively common at around 5 to 10 ...

    Ed FitzGerald - 2015-09-04

  3. Appalacian Green

    ... include quartz , feldspar ( albite twinning ) amphibole s (richterite, tremolite?), mica s ( muscovite , phlogopite ...

    Ed FitzGerald - 2015-09-05

  4. Dakota Mahogany Whetstone

    ... slide area, and muscovite , which is extremely rare. No amphibole s or pyroxene s are visible in this slide. Opaques are also ...

    Raven Mueller - 2015-08-12

  5. Darney

    ... feldspar s, muscovite , mafic minerals ( pyroxene , amphibole , opaques), and lithic fragments. Based on these estimates this ...

    Ed FitzGerald - 2015-09-05

  6. Crystal Stratus

    ... twinning ), mica s ( phlogopite , muscovite ?), amphibole s, sillimanite, vesuvianite ?, opaques, sphene , and possibly ...

    Ed FitzGerald - 2015-09-05

  7. Dakota Mahogany Brown Velvet

    ... , which is common at 5 to 10 percent of slide area. No amphibole s or pyroxene s are visible in this slide. Opaques are also ...

    Raven Mueller - 2015-08-12

  8. Dakota Mahogany Sunset

    ... is common at about 10 percent of slide area. A green-brown amphibole (birefringence .012, biaxial -) is present in low quantities at ...

    Raven Mueller - 2015-08-12

  9. American Bouquet

    ... common at about 5 to 10 percent of slide area. A possible amphibole , based on cleavage, was likely present but is now significantly ...

    Raven Mueller - 2015-09-03

  10. Olympian White

    ... occur in these bands and as individual crystals. Very rare amphibole s (richterite, tremolite?) occur in trace amounts. There is one ...

    Ed FitzGerald - 2015-09-05

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