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  1. Top Ledge Cottonwood

    ... but often absent on other fossil types. Secondary, mostly cryptocrystalline quartz , is present but occupies far less than 1 percent ...

    Raven Mueller - 2015-07-22

  2. Vermont Verde Antique

    ... with common quartz size ranges from .9 mm by .3 mm to cryptocrystalline . Much of the serpentine is fibrous, or in a tigers eye or ...

    Raven Mueller - 2015-09-05

  3. Vein Aleutian Marble

    ... Maximum grain size is near 2.75 mm, minimum is cryptocrystalline in scale. The modal size of matrix grains is ~.1 mm and the ...

    Raven Mueller - 2015-08-12

  4. Harvest Gold

    ... crystal in polycrystalline grains, which ranges down to cryptocrystalline . Modal grain size is approximately .35 to .65 mm. The ...

    Raven Mueller - 2015-07-22

  5. Bottom Ledge Cottonwood

    ... quartz with a modal size around .04 mm and secondary cryptocrystalline quartz with a maximum dimension around 1 mm. All types of ...

    Raven Mueller - 2015-07-22

  6. Onaga

    ... for definitive identification. One example of secondary, cryptocrystalline quartz is present with a maximum dimension of .75 mm. ...

    Raven Mueller - 2015-08-12

  7. How to Use This Site

    ... , coarse , medium , fine , very fine , and  cryptocrystalline ) correspond to the terms shown in the farthest right column in the chart below. The term cryptocrystalline is used for rocks that are so fine-grained that crystals ...

    Ed FitzGerald - 2015-08-12

  8. How We Do It

    ... to limestone the matrix material, which may range from cryptocrystalline micrite to phaneritic sparite, is not considered in the ...

    admin - 2015-08-13