User:Siim

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

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

  • Foraminifera

  • Sulfur and gypsum from a salt dome cap rock

  • Variscite in sandstone

  • Skarn composed of calcite, pyroxene, and garnet

  • Blue asbestos crocidolite (fibrous riebeckite)

  • Collage of sand samples with versatile composition

  • Agate breccia

  • Calcite

  • Conglomerate

  • Coral sand

  • Folded sedimentary rocks

  • Tuff

  • Quartz

Maps[edit]

  • Names and location of Estonian counties

  • Location map of Hiiu maakond

  • Location map of Saare maakond

  • Location map of Lääne maakond

  • Location map of Pärnu maakond

  • Location map of Rapla maakond

  • Location map of Harju maakond

  • Location map of Ida-Viru maakond

  • Location map of Lääne-Viru maakond

  • Location map of Jõgeva maakond

  • Location map of Tartu maakond

  • Location map of Viljandi maakond

  • Location map of Järva maakond

  • Location map of Valga maakond

  • Location map of Võru maakond

  • Location map of Põlva maakond

  • Relief map of Antarctica, based on USGS DEM

  • Relief map of Estonia

Rocks[edit]

Igneous rocks[edit]

  • Amygdaloidal andesite

  • Basalt breccia

  • Basalt in albitite

  • Diabase

  • Diorite

  • Ignimbrite

  • Kimberlite

  • Kimberlite

  • Olivine basalt

  • Olivine basalt

  • Limburgite

Metamorphic rocks[edit]

  • Chlorite schist

  • Eclogite

  • Gneiss

  • Phyllite

  • Quartzite

  • Quartzite

  • Migmatite

Sedimentary rocks[edit]

  • Banded iron formation

  • Dolostone

  • Kukersite

  • Limestone

  • Siltstone

Microphotos of thin sections[edit]

  • Andesite (crossed polars)

  • Diorite (crossed polars)

  • Diorite (plane polarized light)

  • Gabbro (crossed polars)

  • Granite (crossed polars)

  • Graniteporphyry (crossed polars)

  • Granodiorite (crossed polars)

  • Rhyolite (crossed polars)

Geological structures[edit]

  • Glacially abraded rocks in western Norway near Jostedalsbreen glacier

  • Gulch in Scotland

  • Roadside outcrop of schist in Scotland

  • Dike, Island of Mull, Scotland

  • Andesite outcrop. Eastern coast of Scotland


Sand[edit]

  • Heavy mineral sand composed mainly of garnet crystals from Alaska

  • Heavy mineral sand composed mostly of olivine crystals from Hawaii

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