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A thunderegg (or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. [1] Thundereggs are rough spheres , most about the size of a baseball —though they can range from a little more than a centimeter (one half inch) to over a meter (three feet) across.
[6] [7] The world's largest known opal-filled thunderegg, weighing 1.75 tons (1600 kg), is housed at the museum. [ 7 ] [ 28 ] The thunderegg is Oregon's state rock. [ 29 ] Other items include azurite , Oregon sunstone , amber, copper crystals, zeolites , morganite , and agate among others.
Even though the area has been worked by rockhounds for many years, quality thundereggs are still found at the site. There are also some rare rocks and minerals in central Oregon in or near the Ochoco Mountains, including opals, amethyst, gem quality calcite, cinnabar, selenite, gypsum, and amygdaloid nodules. [18] [19]
This is an incomplete list of currently existing shopping centers and malls in the U.S. state of Oregon. ... Bend Factory Stores: Bend: 1990s: 22 [28] Bend River ...
Mill Creek Wilderness is a wilderness area located in the Ochoco National Forest of central Oregon.It was established in 1984 and comprises 17,400 acres (7,040 ha). [1] Of the three wilderness areas in the Ochoco National Forest - Mill Creek, Bridge Creek, and Black Canyon - Mill Creek is the largest and most heavily used.
The Clackamas people once occupied the land that later became Lake Oswego, [7] but diseases transmitted by European explorers and traders killed most of the natives. Before the influx of non-native people via the Oregon Trail, the area between the Willamette River and Tualatin River had a scattering of early pioneer homesteads and farms.
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This list of botanical gardens and arboretums in Oregon is intended to include all significant botanical gardens and arboretums in the U.S. state of Oregon. [1] [2] [3]