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  1. Elberton Granite

    ... textured biotite granite, composed of bluish-gray feldspar , with somewhat pearly cleavage facies, clear colorless quartz ... sample is a plutonic rock dominated by mostly anhedral feldspar and a lesser amount of quartz . The crystalline structure is ...

    Ed FitzGerald - 2015-09-04

  2. Hawthorne Granite

    ... sample is a plutonic rock dominated by mostly anhedral feldspar and a lesser amount of quartz . The crystalline structure is coarse. Maximum crystal dimension is 5.6 mm (feldspar) and minimum is .04 mm (quartz). There is a fairly continuous ...

    Ed FitzGerald - 2015-09-04

  3. Blue Mountain Granite

    ... section. The rock is composed principally of quartz , feldspar , biotite , garnet, opaques, amphibole s, and pyroxene s. Quartz and feldspar account for about 70 percent of slide area. Grains are mostly ...

    Ed FitzGerald - 2015-09-04

  4. Weymouth

    ... This sample is a plutonic rock dominated by anhedral feldspar (~60 percent) and a lesser amount of quartz (~40 percent). The ... structure is coarse. Maximum crystal dimension is 2.4 mm (feldspar) and minimum is <.1 mm (quartz). Modal grain size is around 1.2 to .6 ...

    Ed FitzGerald - 2015-09-05

  5. Adirondack Granite

    ... is composed principally of quartz , plagioclase - feldspar , biotite , and garnet. Quartz and feldspar account for about 85 to 75 percent of slide area. Grains are mostly ...

    Ed FitzGerald - 2015-09-04

  6. Wisconsin Red Granite

    ... rock dominated by mostly anhedral quartz and feldspar . The crystalline structure is coarse. Maximum crystal dimension is 4.8 mm (feldspar). There are two clear modes, one are the original, and larger, ...

    Intern - 2015-09-05

  7. Dolph Pond Granite

    ... size range from about 1.4 to .4 mm. Relative quartz and feldspar contributions are difficult to estimate due to the impact of large ... appearance, excluding the large quartz porphyroblast s, feldspar would predominate. Feldspar twinning is not common but polysynthetic ...

    Ed FitzGerald - 2015-09-04

  8. Alcove Bluestone

    ... metamorphic, or even arenite rock fragments. Rare feldspar , opaque, and other mafic mineral grains are also present. Based on ... a significant amount of very fine grained quartz and perhaps feldspar included in this matrix. This may indicate the presence of small ...

    Intern - 2015-09-05

  9. Greene County

    ... This sample is a plutonic rock dominated by mostly feldspar , including pegmatic crystals, and a lesser amount of quartz . ... Maximum crystal dimension exceeds slide dimension of 25 mm (feldspar); minimum is .1 mm (quartz). Quartz grains are notably smaller on ...

    Raven Mueller - 2015-08-12

  10. American Bouquet

    ... sample is a plutonic rock dominated by mostly anhedral feldspar and a lesser amount of quartz . The crystalline structure is ... ranges to aplitic . Maximum crystal dimension is 9 mm (feldspar) and minimum is .<1 mm (quartz). Quartz grains are notably smaller on ...

    Raven Mueller - 2015-09-03

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