Collections
- Ammonite Collection (69) +
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Dinosaur Collection (668)
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Fish Fossil Collection (205)
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Fossil Collection (1847)
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- Ammonite Fossils (69)
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Mammal Collection (202)
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Mineral Collection (631)
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Reptile Fossil Collection (259)
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Teeth Fossil Collection (614)
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- Tyrannosaur Teeth (63)
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- Wooly Rhino Teeth (20)
- Trilobite Collection (100) +
- Newest Products (2842)
Dinosaur Fossils
- Abelisaur Fossils (18)
- Albertosaurus Fossils (9)
- Allosaurus Fossils (4)
- Ankylosaur Fossils (9)
- Brachylophosaurus Fossils (17)
- Camarasaurus Fossils (12)
- Carcharodontosaurus (26)
- Centrosaurus Fossils (3)
- Chasmosaurus Fossils (5)
- Coprolite Fossils (25)
- Corythosaur Fossils (15)
- Daspletosaurus Fossils (10)
- Dinosaur Egg Shell (12)
- Dinosaur Gem Bone (8)
- Diplodocus Fossils (2)
- Edmontosaurus Fossils (43)
- Elasmosaurus Fossils (59)
- Eocarcharia Dinops Fossils (3)
- Eremiasaurus Fossils (1)
- Footprint Fossils (6)
- Gastrolites Fossils (21)
- Globidens Mosasaur (2)
- Gorgosaurus Fossils (12)
- Gryposaurus Fossils (6)
- Hadrosaurus Fossils (66)
- Halisaurus Fossils (11)
- Hoffmanni Fossils (0)
- Hypacrosaurus Fossils (44)
- Iguanodontid Fossils (7)
- Kryptops Palaios Fossils (6)
- Lambeosaurus Fossils (11)
- Maiasaura Fossils (15)
- Majungasaurus Fossils (10)
- Misc Fossils (9)
- Mosasaurus Fossils (95)
- Nanotyrannus Fossils (10)
- Ouranosaurus Fossil (7)
- Pachycephalosaurus (7)
- Platecarpus Fossils (1)
- Plesiosaurus Fossils (60)
- Prognathodon Fossils (43)
- Pterosaur Fossils (29)
- Raptor Fossils (21)
- Rebbachisaurus Fossils (7)
- Spinosaurus Fossils (46)
- Stegosaurus Fossils (10)
- Struthiomimus Fossils (2)
- Suchomimus Fossils (21)
- Tenontosaurus Fossils (3)
- Thescelosaurus Fossils (5)
- Torosaurus Fossils (7)
- Triceratops Fossils (44)
- Tyrannosaur Fossils (69)
- Tyrannosaurus Rex (23)
Minerals
- Agate Minerals (72)
- Amazonite Minerals (6)
- Amethyst Minerals (14)
- Andalucite Minerals (2)
- Apatite Minerals (2)
- Aragonite Minerals (43)
- Azurite Minerals (16)
- Banded Agate Minerals (28)
- Barite Minerals (42)
- Calcite Crystal (61)
- Carved Minerals (20)
- Celestite Minerals (2)
- Cerussite Minerals (16)
- Chabazite Minerals (12)
- Chrysocolla Minerals (43)
- Copper Minerals (11)
- Crystals Quartz (73)
- Dragon Blood Jasper (1)
- Dendrite Minerals (18)
- Epidote Minerals (25)
- Erythrite Minerals (2)
- Fluorite Minerals (16)
- Fulgurite Minerals (27)
- Gabbro Minerals (10)
- Galena Minerals (19)
- Ghost Quartz (7)
- Grape Agate Minerals (11)
- Halite Minerals (18)
- Hematite Minerals (8)
- Jasper Minerals (41)
- Kyanite Minerals (3)
- Lapis Lazuli Minerals (2)
- Malachite Minerals (43)
- Nontronite Minerals (5)
- Ocean Jasper Minerals (3)
- Peacock Ore (18)
- Peridot Minerals (20)
- Picture Jasper Mineral (2)
- Pink Halite Minerals (18)
- Pink Tourmaline & Rubellite (1)
- Polychrome Jasper Minerals (13)
- Prehnite Minerals (28)
- Purpurite Minerals (17)
- Pyrite Minerals (31)
- Rhodonite Minerals (1)
- Ruby In Zoisite Minerals (2)
- Sardonyx Minerals (1)
- Septarian Minerals (23)
- Serpentine Minerals (48)
- Sodalite Minerals (0)
- Sulfur Minerals (15)
- Tourmaline Minerals (24)
- Turquoise Minerals (8)
- Unakite Minerals (9)
- Vanadinite Minerals (17)
Andalucite Mineral Collection
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Andalucite, a significant mineral in the geological and mineralogical fields, derives its name from Andalusia, a region in southern Spain where it was first identified and described. This aluminum nesosilicate mineral is characterized by its distinctive crystal structure and its formation under specific metamorphic conditions. Its presence in Spain, particularly in the Andalusian region, has been crucial for understanding its geological context and its role as an indicator mineral.
Andalucite is one of three polymorphs of Al2SiO5, the other two being kyanite and sillimanite. These polymorphs share the same chemical composition but differ in their crystal structures, which are stable under different pressure and temperature conditions. Andalucite typically forms in medium-grade metamorphic rocks, often associated with regional metamorphism. Its presence indicates a specific range of pressure and temperature conditions during the rock's formation, making it a valuable tool for geologists studying metamorphic processes.
The crystal system of andalucite is orthorhombic, meaning its crystals have three axes of unequal length that are mutually perpendicular. Common crystal habits include prismatic forms, often with a square cross-section. The color of andalucite can vary, ranging from pink, red, and violet to brown, green, and even colorless. This variability in color is often due to the presence of trace elements within its crystal lattice. A notable variety of andalucite is chiastolite, which exhibits a distinctive cruciform pattern of dark carbonaceous inclusions within the lighter mineral. This pattern is a result of the growth mechanism of the crystal, where impurities are preferentially incorporated along specific crystallographic directions.
