BETA

Crystal Stratus

Submitted by Ed FitzGerald on Mon, 2014-11-24 10:43
Trade Name Alias: 
Stone Type (Commercial): 
Description: 

Gray, green with a touch of peach crystalline veins. The wildest of all Danby grades with lots of movement throughout. Large crystals can appear.

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: 
12.10
Geology
Stone Type (Lithologic): 
Grain Shape: 
Angular
Grain Size: 
Coarse
Medium
Petrographic Description: 

Specimen: 2014-074-1
This sample is a relatively coarse grained marble with a somewhat diverse chemical composition. The texture is overall granoblastic with random grain orientation. Maximum carbonate grain size is about 3.25 mm, minimum is .1 mm, and the modal size is 1.75 to .75 mm. Grain boundaries are mostly curved or straight with a lesser amount of sutured boundaries. Twin lamellae in carbonates are common. Non-carbonate accessory minerals minimally include quartz, feldspars (albite twinning), micas (phlogopite, muscovite?), amphiboles, sillimanite, vesuvianite?, opaques, sphene, and possibly brucite as well as other unidentified low birefringence minerals. The most common accessory minerals are aggregates dominated by quartz, which reflect significant stress induced nucleation, producing sutured masses of grains with significant size variance. Maximum quartz grain dimensions are near 3 mm, most are significantly smaller. Most other non-carbonate accessory minerals are present in bands and aggregates. The small size of most crystals precludes definitive identification of all minerals. All non-carbonate accessory minerals constitute about 20 percent of slide area. Approximately 75 percent of this area is subsumed by quartz alone. Accessory minerals produce a visible banding in the thin section. The hand specimen appears to be a cloudy, heterogeneous mix of mineral components.
MP 9/4/15

Specimen: 2014-074-2
This sample is a relatively coarse grained marble with a somewhat diverse chemical composition. The texture is overall granoblastic with random grain orientation. Maximum carbonate grain size is about 2 mm, minimum is .1 mm, and the modal size is 1.25 to .75 mm. Grain boundaries are mostly curved or straight with a lesser amount of sutured boundaries. Twin lamellae in carbonates are common. Accessory minerals minimally include quartz, feldspars (albite twinning), micas (phlogopite, muscovite?), sillimanite, vesuvianite?, opaques, sphene, and possibly brucite as well as other unidentified low birefringent minerals. Most accessory minerals are located in aggregated masses composed principally of a fine grain groundmass of very low birefringence. Feldspars and quartz are clearly a component of this groundmass but other minerals, such as brucite likely also are present. The other listed accessory minerals are mostly intermixed in this aggregate, except the trace amounts of what is likely vesuvianite, which appears only as individual crystals. Platy mica minerals are common in these aggregates. These regions of the slide comprise about 40 percent of total slide area. Sporadic grains of quartz and micas are also spread throughout the carbonate portion of the slide as individual crystals and small aggregates. In total non-carbonate grains comprise 45 to 55 percent of slide area. It is difficult to perceive the character of macrostructure in this slide given that there is a near even split between the two principal composition areas. The hand specimen appears to be a cloudy, heterogeneous mix of mineral components with only minimal discernable banding structure.
MP 9/4/15

Images

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Specimen ID
2014-074-1 Image of specimen in dry conditions. Finish: Polisheddownload image
2014-074-2 Image of specimen in dry conditions. Finish: Honeddownload image

Thin Sections

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Specimen ID Non-polarized Cross-polarized
2014-074-1 Specimen shown in non-polarized light.download image Specimen shown in cross-polarized light.download image
2014-074-2 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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