Please follow any signs or staff instructions regarding the Worry Rock. Do not remove or chip the rock as EarthCache rules prohibit removing natural material.
Just outside the Hapeville Depot Museum sits a curious piece of local history. A large granite slab know as the Hapeville Worry Rock. The Worry Rock measures roughly 6 ft × 3 ft in size. It was placed here in December of 1937 and was officially dedicated in January of 1938. It has since become a unique landmark in this little town. Hapeville sits in the Piedmont geological province of Georgia. The Piedmont is underlain by a patchwork of crystalline igneous and metamorphic rocks (granites, gneisses, schists, etc.) that are the deeply eroded roots of ancient mountain belts.
According to local lore, the Worry Rock once served as an unusual stage for small-town justice. A man arrested for public drunkenness was reportedly given a choice: pay a fine or spend two hours sitting on the rock for all to see. He supposedly chose the public punishment, and the story has endured as a quirky chapter in Hapeville’s history. Over the years, the rock has slowly faded into oblivion. Today, only locals and die-hard curiosity seekers know of its existence... until now.
Obtained from a local quarry, what makes this rock especially interesting isn't just the story, but its various geological features. The Worry Rock's composition and texture provide a glimpse into the geologic events that shape the Piedmont Region. In addition, the dramatic quartz vein slicing across its surface reveals how later-forming minerals can impact the textures of an original rock.
Rock type: Granite is an intrusive igneous rock that forms from the slow cooling of magma deep within the Earth’s crust. Mineralogically, it is typically composed of quartz, feldspar (both potassium and plagioclase), and mica (usually biotite or muscovite), with minor amounts of other minerals being possible. The interlocking arrangement of these minerals gives granite its characteristic strength and texture. Depending on the proportion and size of its minerals, granite can range in color from light gray to pink or reddish. Granite may also sometimes reflect light, producing a subtle sparkle or shimmer. However, this effect is not always visible and is not necessarily a defining characteristic.
Texture: Granite typically has an interlocking texture made up of individual mineral grains. The size and arrangement of these grains can vary, producing varying textures from coarse to smooth. Close observation often reveals patterns and variations within the stone itself. These differences reflect the slow cooling of the molten rock deep underground, allowing minerals to grow and lock together. Subtle changes in grain size or alignment can also hint at the pressures and conditions the granite experienced long after it first formed.
Quartz vein - Quartz veins are formed when silica-rich fluids move through cracks or fractures in pre-existing rocks and crystallize. They appear in different ways. PLANAR veins are straight and relatively uniform while BRANCHING veins split into multiple pathways as they follow weaknesses in the host rock. Quartz veins typically crosscut the surrounding rock. Cutting across pre-existing mineral grains rather than growing along them, which indicates the vein formed after the host rock solidified. Studying these veins give geologists clues about fluid movement, pressure conditions, and the timing of geological events within the Earth’s crust.
To log this Earthcache, please complete the items below, and send them to the CO, using the message feature in Geocaching.com. Note that the photo is required.
Do *NOT* post answers in your log, or it will be deleted. You do not need to wait for a response in order to log.
1) From your own observations, is there any subtle sparkle or shimmer visible due to the mineral composition of the Worry Rock?
2) From your own observations, describe the texture of Worry Rock. Is it coarse, medium, or fine-grained? What about the quartz vein itself?
3. From your own observations, and the information above, what type of quartz vein is present in Worry Rock (planar or branching) and why do you think that?
4) Post a personal picture in your log of your GPS, yourself, your geonick written on your hand, a TB, etc, at the site. Be sure the Worry Rock is in your photo, but take care not to expose any possible answers! Note that the photo, per HQ guidelines, is an acceptable requirement, and logs without a photo will be deleted!
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