World's Largest Geode EarthCache
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Come take a Lake Erie island adventure and claim a smiley
on an EarthCache showing some unique Ohio geology.
The World's Largest Geode, Crystal Cave, South Bass
Island, Put-in-Bay, Ohio
Geodes are rock formations that occur in sedimentary and certain
volcanic rocks. They are basically cavities with internal crystal
formations. Crystal Cave is the world's largest geode. Discovered
in 1887 as workers for the winery were digging a well, the cave is
located about 40 feet below the surface. The crystals have a
blueish color and are made of strontium sulfate (SrSO4). The geode
is 35 feet in diameter at its widest point and some of the crystals
that measure as wide as 18 inches across and weighing up to 300
lbs. The present geode is smaller than it was when it was
originally discovered because some of the crystals were harvested
and sold for the manufacturing of fireworks.
At the time of posting, tours of Crystal Cave
and the above winery are offered for $6 for adults and $3 for
children ages 6 to 11. Tours are offered seven days a week from
early May till late September. Monday through Saturday, tours of
the cave begin at 10:15 a.m. and continue throughout the day till 5
p.m. On Sunday, tours begin at 12:15 p.m. and continue till 5
p.m.
To claim a find, please email me the answers to the questions
below. Also you will need to upload a picture of yourself
displaying your GPSr standing inside the geode.
Question 1: The crystals have are made of strontium
sulfate(SrSO4), what is another name for strontium sulfate?
Question 2: How are geodes formed?
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This is a result of “armchair/desktop” EarthCaching
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