Welcome to the Hugh Story Memorial Rose Garden
As you explore Liberty Station, you may come across the vibrant plantings of the Hugh Story Memorial Rose Garden. At the garden stands a polished black granite marker that quietly honors the space and those connected to it. Though it may appear to be just a simple stone, this piece of granite holds a story about Earth’s geologic history and the remarkable durability of natural rock. This EarthCache will guide you in exploring the granite’s properties, how it formed, and why it was chosen for this memorial setting.
What Is Black Granite?
Granite is an igneous rock that forms from magma slowly cooling deep beneath Earth’s surface, allowing large mineral crystals to develop. True granite contains minerals such as quartz, feldspar, and mica. Quartz is usually clear or milky with a glassy appearance. Feldspar often appears white, pink, or light gray with a blocky shape. Mica is dark or silvery and forms thin, shiny sheets. In memorials and construction, the term "black granite" is commonly used for very dark polished stone, though some stone sold under this name is not technically granite and may instead be closely related intrusive igneous rocks such as gabbro or diorite, which contain a higher proportion of dark minerals like biotite or hornblende.
Whether granite or a similar dark intrusive rock, this stone is extremely hard and resistant to weathering, which is why it is commonly used in buildings, monuments, and memorials that must endure the elements. It withstands rain, wind, and temperature changes while maintaining its polished surface and structural integrity for decades or longer. The dark color emphasizes mineral patterns and creates strong visual contrast, making crystal features and engraved details easier to observe and appreciate.
The designers of the Hugh Story Memorial Rose Garden selected black granite for the garden marker because it is permanent and resilient, symbolizing remembrance and continuity. Its polished surface and deep color create a calm visual contrast with the surrounding roses and greenery, allowing the marker to stand out while still fitting naturally into the peaceful garden environment. Using granite connects the memorial to Earth’s geologic story, highlighting the natural strength and longevity of stone formed over millions of years.
Tasks for This EarthCache
To log this EarthCache, visit the site and complete the following tasks. Send me your answers via Geocaching or email.
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Include “Hugh Story Memorial Rose Garden - GCBDB88” on the first line of your message.
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Observe the black granite of the marker. Describe the (a) color, (b) texture, and (c) reflective quality of the granite.
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Can you identify any mineral crystals in the granite, such as quartz or feldspar? How large are the crystals?
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Explain why this stone appears black. Which minerals are present and how does their abundance affect the color?
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Why do you think the designers chose black granite for the marker at this garden?
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In your log, attach a photo of yourself or a personal item with the marker at the posted coordinates. (Note: photos predating the publication of this EarthCache are not accepted.)
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