BETA

Eureka

Submitted by Ed FitzGerald on Mon, 2014-11-24 10:40
Stone Type (Commercial): 
Description: 

Darker gold and gray veins (compared often to Calacatta Gold). Medium to heavy veining.

Availability: 
Available
Physical Data
Absorption (%): 
0.06
Density (lb/cf): 
169.20
Flexural Strength, Dry (psi): 
1,226
Modulus of Rupture, Dry (psi): 
1,077
Compressive Strength, Dry (psi): 
9,475
Bulk Specific Gravity: 
2.71
Abrasion Resistance: 
0.06
Geology
Stone Type (Lithologic): 
Grain Shape: 
Angular
Grain Size: 
Medium
Petrographic Description: 

Specimen: 2014-072-1
This sample is a moderately coarse grained marble. The texture is overall granoblastic with random grain orientation. Maximum carbonate grain size is around 1.7 mm, minimum is .1 mm, the modal size is .7 to 1.3 mm. Grain boundaries are mostly curved or straight with a lesser amount of sutured boundaries. Twinning lamellae in carbonates are common. Indistinguishable quartz and feldspars are the most common non-carbonate accessory minerals, occurring mostly as isolated grains with some instances of small aggregates. Individual quartz grains have a maximum dimension of .4 mm, most are significantly smaller with a modal size around .2 Aggregates of likely pure quartz have a maximum dimension near 1.1 mm. Feldspars were only definitively identified in a few instances where albite or Carlsbad twinning was observable. Rare aggregates of mica, likely phlogopite or muscovite are present, sometimes in association with quratz/feldspar. All non-carbonate accessory minerals constitute less than 5 percent of slide area. Quartz, feldspar, mica, bearing aggregates occur in only localized regions, generally associated with a finer grained carbonate texture. These associations produce a weak banding appearance in the slide. Some diffuse banding is also visible in the hand sample. There is no appreciable weathering in this sample.
MP 9/4/2015

Specimen: 2014-072-2
This sample is a moderately coarse grained marble. The texture is overall granoblastic with random grain orientation. Maximum carbonate grain size is around 1.5 mm, minimum is .1 mm, the modal size is .5 to 1 mm. Grain boundaries are mostly curved or straight with a lesser amount of sutured boundaries. Twinning lamellae in carbonates are ubiquitous. Most non-carbonate accessory minerals occur in aggregate bands with a distinct orientation. These are composed principally of a very low birefringent, uniaxial negative mineral, apatite seems a likely candidate but others such as vesuvianite are possible. Other low birefringent unidentified minerals are also certainly present. Mica species (phlogopite, muscovite?) are also present in these aggregates. Outside of these aggregates the only non-carbonate accessory minerals are rare and small quartz grains (~.2 mm) and even rarer opaque (~.1 mm) minerals. All non-carbonate accessory minerals constitute less than 5 percent of slide area. The aggregate accessory mineral clusters create a weak, localized banding appearance. Diffuse banding is also visible in the hand sample. There is no appreciable weathering in this sample.
MP 9/4/2015

Images

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Specimen ID
2014-072-1 Image of specimen in dry conditions. Finish: Polisheddownload image
2014-072-2 Image of specimen in dry conditions. Finish: Honeddownload image

Thin Sections

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Specimen ID Non-polarized Cross-polarized
2014-072-1 Specimen shown in non-polarized light.download image Specimen shown in cross-polarized light.download image
2014-072-2 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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