Siim

My name is Siim Sepp. I am a geologist and science writer.

Most of my photos are available on my educational website: Sandatlas.

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  Foraminifera
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  Sulfur and gypsum from a salt dome cap rock
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  Variscite in sandstone
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  Skarn composed of calcite, pyroxene, and garnet
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  Blue asbestos crocidolite (fibrous riebeckite)
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  Collage of sand samples with versatile composition
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  Agate breccia
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  Calcite
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  Conglomerate
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  Coral sand
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  Folded sedimentary rocks
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  Tuff
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  Quartz

Maps

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  Names and location of Estonian counties
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  Location map of Hiiu maakond
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  Location map of Saare maakond
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  Location map of Lääne maakond
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  Location map of Pärnu maakond
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  Location map of Rapla maakond
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  Location map of Harju maakond
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  Location map of Ida-Viru maakond
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  Location map of Lääne-Viru maakond
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  Location map of Jõgeva maakond
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  Location map of Tartu maakond
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  Location map of Viljandi maakond
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  Location map of Järva maakond
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  Location map of Valga maakond
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  Location map of Võru maakond
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  Location map of Põlva maakond
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  Relief map of Antarctica, based on USGS DEM
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  Relief map of Estonia

Rocks

Igneous rocks

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  Amygdaloidal andesite
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  Basalt breccia
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  Basalt in albitite
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  Diabase
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  Diorite
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  Ignimbrite
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  Kimberlite
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  Kimberlite
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  Olivine basalt
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  Olivine basalt
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  Limburgite

Metamorphic rocks

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  Chlorite schist
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  Eclogite
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  Gneiss
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  Phyllite
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  Quartzite
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  Quartzite
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  Migmatite

Sedimentary rocks

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  Banded iron formation
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  Dolostone
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  Kukersite
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  Limestone
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  Siltstone

Microphotos of thin sections

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  Andesite (crossed polars)
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  Diorite (crossed polars)
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  Diorite (plane polarized light)
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  Gabbro (crossed polars)
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  Granite (crossed polars)
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  Graniteporphyry (crossed polars)
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  Granodiorite (crossed polars)
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  Rhyolite (crossed polars)

Geological structures

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  Glacially abraded rocks in western Norway near Jostedalsbreen glacier
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  Gulch in Scotland
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  Roadside outcrop of schist in Scotland
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  Dike, Island of Mull, Scotland
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  Andesite outcrop. Eastern coast of Scotland

Sand

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  Heavy mineral sand composed mainly of garnet crystals from Alaska
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  Heavy mineral sand composed mostly of olivine crystals from Hawaii