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Hawthorne Granite

Submitted by Ed FitzGerald on Tue, 2015-01-13 14:42
Stone Type (Commercial): 
Availability: 
Available
Physical Data
Absorption (%): 
0.27
Modulus of Rupture, Dry (psi): 
2,264
Compressive Strength, Dry (psi): 
4,580
Bulk Specific Gravity: 
2.66
Geology
Stone Type (Lithologic): 
Grain Shape: 
Angular
Grain Size: 
Very Coarse
Medium
Petrographic Description: 

Specimen: 2014-082-1
This 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 gradation in grain sizes without a clear mode, but most grains are under 2 mm. Feldspar twinning is common and is predominantly tartan (microcline) with a minimal amount of polysynthetic. Grain boundaries are mostly smooth curving with some instances of consertal sutured. Quartz is a relatively small component of slide area, >20 percent. Almost all quartz grains present wave extinction. Intergrowth textures include microperthitic involving multiple species of feldspar and granophyric with plagioclase intergrown with quartz. Accessory minerals include biotite, which is common at 15 to 20 percent of slide area. Opaques occupy about 5 percent of slide area and muscovite is present at less than 1 percent. There are slight signs of incipient alteration of feldspars with some grains presenting a dusty look and minimal amounts of sericitization. There is a discontinuous band of secondary carbonate that runs across one corner of the slide with a maximum width of .4 mm.
MP 9/4/2015

Specimen: 2014-082-2
This sample is a plutonic rock dominated by mostly anhedral quartz and feldspar. The crystalline structure is coarse. Maximum crystal dimension is 4 mm (feldspar) and minimum is .04 mm (quartz). There is a fairly continuous gradation in grain sizes without a clear mode, but most grains are under 2 mm. Feldspar twinning is predominantly tartan but polysynthetic is also common. Grain boundaries are mostly smooth curving with some instances of consertal sutured. Almost all quartz grains present wave extinction, and many of the smaller quartz grains may result from grain nucleation. Relative amounts of quartz and feldspar are difficult to estimate due to visual similarity, but quartz likely occupies only 20 to 30 percent of slide area. Perthitic textures are rarely present in feldspars. Biotite is the most common accessory mineral at 10 to 15 percent of slide area. Opaques occupy about 5 percent of slide area. Muscovite is present in trace amounts. There are slight signs of incipient alteration of feldspars with some grains presenting a dusty look and minimal amounts of sericitization.
MP 9/4/2015

Specimen: 2014-082-3
This sample is a plutonic rock dominated by mostly anhedral quartz and feldspar. The crystalline structure is coarse. Maximum crystal dimension is 4 mm (feldspar) and minimum is .04 mm (quartz). There is a fairly continuous gradation in grain sizes without a clear mode, but most grains are under 2 mm. Polysynthetic was the predominant form of feldspar twinning observed, with only a localized cluster of tartan twinning patterns. Grain boundaries are mostly smooth curving with some instances of consertal sutured. Almost all quartz grains present wave extinction, and many of the smaller quartz grains may result from grain nucleation. Relative amounts of quartz and feldspar are difficult to estimate due to visual similarity, but feldspar predominates. Rare granophyric intergrowth textures are present. Biotite is the most common accessory mineral at 10 to 15 percent of slide area. Opaques occupy about 5 percent of slide area. Epidote is present in trace amounts. There are slight signs of incipient alteration of feldspars with some grains presenting a dusty look and minimal amounts of sericitization.
MP 9/4/2015

Specimen: 2014-082-4
This sample is a plutonic rock dominated by mostly anhedral quartz and feldspar. The crystalline structure is coarse. Maximum crystal dimension is 12 mm (feldspar) and minimum is .04 mm (quartz). The largest grain is an unrepresentative phenocryst, but there is a fairly continuous gradation in grain sizes between about 4 mm and .04 mm without a clear mode. Most grains are under 2 mm. Polysynthetic, Carlsbad, and tartan feldspar twinning are all present. Grain boundaries are mostly smooth curving with some instances of consertal sutured. Many quartz grains present wave extinction, and many of the smaller quartz grains may result from grain nucleation. Relative amounts of quartz and feldspar are difficult to estimate due to visual similarity, but clearly feldspar predominates. Rare granophyric intergrowth textures are present. Biotite is the most common accessory mineral at 10 to 15 percent of slide area. Opaques occupy about 5 percent of slide area. Epidote and muscovite are present in trace amounts. There are slight signs of incipient alteration of feldspars with some grains presenting a dusty look and minimal amounts of sericitization; a few biotite grains are altered to chlorite.
MP 9/4/2015

Images

Thin Sections

Quarry

NOTE: Quarry locations are approximate.

Adirondack Natural Stone Quarries
8986 State Rt. 4
12887 Whitehall , New York
United States
43° 28' 52.8888" N, 73° 25' 48.108" W
New York US

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