BETA

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  1. Elberton Granite

    ... The granite is a compact, fine-grained,even textured biotite granite, composed of bluish-gray feldspar , with somewhat pearly ... clear colorless quartz and the ferro-magnesium mineral, biotite. The constitute grains of these minerals are closely and intricately ...

    Ed FitzGerald - 2015-09-04

  2. Adirondack Granite

    ... principally of quartz , plagioclase - feldspar , biotite , and garnet. Quartz and feldspar account for about 85 to 75 percent ... suggesting relatively few to no potassium feldspars. Biotite occupies about 10 percent of slide area. Modal biotite size is around ...

    Ed FitzGerald - 2015-09-04

  3. Blue Mountain Granite

    ... rock is composed principally of quartz , feldspar , biotite , garnet, opaques, amphibole s, and pyroxene s. Quartz and ... is the most common and has a maximum crystal size of 2.4 mm. Biotite is the also common and occurs in aggregates up to 1.2 mm in maximum ...

    Ed FitzGerald - 2015-09-04

  4. Dolph Pond Granite

    ... intergrowths are also visible. All non quartz- biotite minerals occupy about 25 to 30 percent of slide area. These accessory minerals occur most often in aggregates. Biotite is the most common accessory mineral and occupies about 5 to 10 percent ...

    Ed FitzGerald - 2015-09-04

  5. Buckingham

    ... to be individually perceived. Visible crystals of mica ( biotite ) are mostly .55 mm and less in length and comprise about 5 percent of ... to be individually perceived. Visible crystals of mica (biotite) are mostly .5 mm and less in length and comprise about 5-10 percent of ...

    Ed FitzGerald - 2015-09-04

  6. Hawthorne Granite

    ... intergrown with quartz. Accessory minerals include biotite , which is common at 15 to 20 percent of slide area. Opaques occupy ... Perthitic textures are rarely present in feldspars. Biotite is the most common accessory mineral at 10 to 15 percent of slide area. ...

    Ed FitzGerald - 2015-09-04

  7. Grayson

    ... presumably form the majority of the specimen’s fabric. Biotite comprises approximately 15 percent of slide area. Identifiable crystals of biotite have a maximum dimension of .3 mm. Other species of mica have a maximum ...

    Raven Mueller - 2015-08-12

  8. Weymouth

    ... textures appear to be lacking. Accessory minerals include biotite , pyroxene s, opaques, and muscovite . Together these minerals ... and zoned grains. Accessory minerals include muscovite, biotite, opaques, and highly altered pryroxenes/ amphibole s. Together these ...

    Ed FitzGerald - 2015-09-05

  9. Wausau Red Granite

    ... quite rare and comprise less than 5 percent of slide area. Biotite is the most common and opaques are also present. Alteration minerals ... rare and comprise less about 3 to 5 percent of slide area. Biotite is the most common and opaques and muscovite are present in trace ...

    Intern - 2015-09-04

  10. Wisconsin Red Granite

    ... rare and comprise only about 5 percent of slide area. Biotite is the most common accessory mineral and is often altered to ... rare and comprise only about 5 to 10 percent of slide area. Biotite is the most common accessory mineral and is often altered to chlorite. ...

    Intern - 2015-09-05

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