- Tests Confirm Quality of Elberton Granite
- Renovations Complete on Elberton's Downtown Display
EGA
QUALITY REPORT:
The Stone Industry recognizes granite as one of the hardest of all natural
stones. Elberton Granite has been a stone of choice for public and
private memorials as well as countless commercial uses for almost 100 years.
In 1969 the Elberton Granite Association contracted with the Georgia
Institute of Technology (Georgia Tech) to run a blind test on samples of
Elberton Granite as well as a few samples from other areas. The tests
were done to determine the physical and mineral properties of Elberton Granite
and how it compares with other granites. The results of these tests
have been shared with the industry for decades.
In response to the diversity of products being produced by E.G.A. Member-Firms
today that require mineral and structural test date, E.G.A. submitted six
samples of granite for testing. The stone was provided by quarries
located from one end of the 35-mile-long deposit to the other. The
samples were identified only by number. All samples were subjected
to five basic ASTM standardized tests. Those tests included C-97
Ratio of Absorption, C-99 Modules of Rupture, C-170 Compressive Strength,
C-241 Abrasion Resistance and C-97 a Bulk Specific gravity. In addition
two of the samples had a complete Petrographic Analysis done to identify
all components and their percentage of the total volume. The samples
were also examined by x-ray fluorescence for a chemical analysis.
Test Results
In the petrographic analysis, every element of the stone was identified.
Quartz was found to be the major component accounting for 37% of
the mineral content and 77% of the volume by chemical analysis. This
exceptionally high quartz content is what makes Elberton Granite so hard.
On absorption by weight Elberton Granite tested at 37% after being
submerged in water for 48 hours. This is below the .40 ASTM requirement.
Elberton Granite also exceeded the 19,000 Psi, ASTM standard for
compressive strength with an average of 23,026 Psi. Elberton Granite
was found to exceed every test of durability like flexural strength and
modules of rupture. All test results were better than the ASTM designated
standards. (See table No. 1)
Consistent Quality
It should come as no surprise that the 2004 reports indicate there is
virtually no change from the test results done in 1969. While 35
years is not old in terms of stone that was formed some 400 million years
ago, the new test results do confirm the consistency of Elberton Granite
and gives assurance to customers that this stone will perform in any application.
E.G.A.'s Certified Memorial Program is supported by these findings.
The heart of the Certified Memorial Program is the quality of the stone
and the results of these recent tests confirm to the Industry the exceptional
quality of Elberton Granite. E.G.A. is pleased to offer a copy of
the test results. Return the coupon below for the mineralogical and
physical properties test results of Elberton Granite.
Most importantly, the quality of Elberton Granite has been proven by
its use for outstanding memorials throughout the United States and around
the world for almost 100 years. Comparing these test results with
those of other granites shows Elberton Granite to be one of the finest materials
available for monumental purpose. (See Table No. 2)
TABLE No. 1
ASTM TECHNICAL INFORMATION
| Test Results |
ASTM Test |
Standard |
| Absorption by weight, % - 37 |
C-97 |
40 |
| Density, lbs/ft 3 - 165.00 |
C-97 |
160.00 |
| Compressive strength, psi (Mps) - 23,026 |
C-170 |
19,000 |
| Abrasion resistance, hardness - 25.1 |
C-241 |
25.1 |
| Flexural strength, psi (MP) - 1,669.83 |
C-880 |
1,2000 |
| Modules of rupture, psi - 1,717.38 |
C-99 |
1,500 |
TABLE No. 2
Comparison By Chemical Analysis
|
Elberton Granite |
Other Leading |
| |
2004 |
1969 |
Granites |
| Silica (SiO2) |
72.4% |
69.83% |
69.89% |
| Alumina (Ai2O) |
15.3 |
16.56 |
15.08 |
| Iron Sequi-Oxide (Fe2O3) |
2.74 |
1.36 |
2.50 |
| Lime (CaO) |
1.81 |
1.94 |
2.07 |
| Magnesia (MgO) |
.65 |
.45 |
.66 |
| Soda (Na2O3) |
3.74 |
4.74 |
4.73 |
| Potash (K2O) |
5.2 |
5.03 |
4.29 |
| Loss of ignition |
0 |
.47 |
.54 |
| |
101.84 |
100.38 |
99.76 |
DOWNTOWN MEMORIAL DISPLAY:
A major renovation has been completed at EGA's
Outdoor Monument Display in Downtown Elberton. The Display is a Granite
Capital landmark showcasing outstanding memorials produced by EGA Members.
Located at the busy intersection of North Oliver and Elbert streets, the
Display is a unique site attracting widespread attention from local citizens
and visitors to the community. It has a special attraction for Monument
Industry visitors.

The Display has been maintained by EGA since 1970 as both an exhibit
for the Monument Indsutry's best craftsmanship and also a community relations
project. Monuments are changed every six months. The area was a civic eyesore
before EGA began utilizing it.
The Displays huge, 110-foot long, plywood backdrop had deteriorated and
EGA's Advertising and Public Relations Committee approved a major renovation.
This included replacing the backdrop with a light-colored, more permanent
metal material.
More photos and information is available in the Fall 2004 issue of the
"Elberton Graniteer."
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