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vwiest: Anacostia River, MD
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vwiest: Yellow House
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e.wellmeier: Heisey Glass Series
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pavlin722007: Azurite, Malachite, Limonite; Murzinka, Altai
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Stan Celestian: Trinitite - A BLAST (!) from the Past (Closer View)
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Stan Celestian: Trinitite - A BLAST (!) from the Past
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Stan Celestian: Trinitite (bottom view)
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Stan Celestian: Trinitite (side view)
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wyojones: Moinho do Frade
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wyojones: House Made of Basalt Blocks
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wyojones: Sunset Cloud
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wyojones: Alkali Lake Reflection
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wyojones: Sunset Panorama at Alkali Lake
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wyojones: Red Lake
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swissgeologyfan: Sunrise in Hurricane, Utah
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Teacher & Philatelist in Phuket, Thailand: 26655v
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Teacher & Philatelist in Phuket, Thailand: US-3154507
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Teacher & Philatelist in Phuket, Thailand: Philatelic Truck ss on cover from NY World's fair
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SoCalCameraHappy: Yosemite 498
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swissgeologyfan: Comet Tsuchinshan-Atlas
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swissgeologyfan: Comet Tsuchinshan-Atlas
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swissgeologyfan: Pseudotachylyte
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lostwelder: Michigan snowflake
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Dietmar Down Under: Peperite closeup
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Edeee: Peperite- Jigsaw fit
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Edeee: Peperite 2
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Dietmar Down Under: Peperite
jurvetson: Ensisheim — The Witnessed Meteorite Fall of 1492
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SRL Gemtone: Stalactites Goethite
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SRL Gemtone: Creepy Smile - Thunder Egg / Fox Agate