BETA

Variegated

Submitted by Raven Mueller on Wed, 2014-07-09 13:41
Stone Type (Commercial): 
Availability: 
Available
Physical Data
Color: 
Munsell Color(s): 
Geology
Stone Type (Lithologic): 
Grain Shape: 
Subrounded
Rounded
Grain Sorting: 
Poorly-Sorted
Grain Size: 
Coarse
Medium
Petrographic Description: 

Specimen: 2014-028
This specimen is a fossiliferous limestone. The limestone is grain supported and has a sparite cement matrix with some syntaxial overgrowth. Allochems constitute about 80 percent of slide area. These criteria define the limestone as a grainstone. Allochem composition is about 75 percent bioclast, 15 percent ooid, and 10 percent peloid. These estimates and degree of sorting classify this limestone as a sorted biosparite. Most all bioclasts have micritic envelopes. Identifiable bioclasts are mostly echinoderm parts; bryozoan, brachiopod, bivalve, and foraminifera are also identifiable. Maximum dimension of echinoderms is approximately 1 mm and the modal range is about .6 mm. Maximum dimensions of less common bioclasts are as follows: bryozoan 2 mm, brachiopod 2 mm, bivalve 3 mm, and foraminifera 1 mm. Ooid and peloid maximum size is about .7 mm and the modal range is around .3 mm. Authigenic quartz is rarely present at far less than 1 percent of slide area. Rare, likely secondary, polycrystalline growths reach a maximum of 1.1 mm. Monocrystalline forms are much more common and smaller with a maximum near .05 mm. Extant voids are essentially absent with only a few interparticle examples. The degree of allochem preservation indicates this limestone was lithified before significant compaction. Elongated bioclasts are oriented in a uniform direction producing minimal laminated texture that is not visible in the hand sample.
MP 7/21/2015

Images

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Specimen ID
2014-028 Image of specimen in dry conditions. Finish: Smooth sawndownload image Close-up image of specimen in dry conditions. Finish: Smooth sawndownload image Image of specimen in wet conditions. Finish: Smooth sawndownload image Close-up image of specimen in wet conditions. Finish: Smooth sawndownload image

Thin Sections

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Specimen ID Non-polarized Cross-polarized
2014-028 Specimen shown in non-polarized light.download image Specimen shown in cross-polarized light.download image

Quarry

No quarry information available for this stone.

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