Quartz Tumbled- 1.1 g
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Lot of natural quartz cobbles, polished, weighing about 1.1 kg, from the Costa Dorada on the Spanish Mediterranean coast.
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Description from the seller
Batch of natural cobbles (clasts) – Costa Dorada, Spain – Mineralogical and Petrological Selection
Technical Description of the Lot
This lot consists of a selection of natural cobbles (continental clasts) collected on the coast of Costa Dorada (Tarragona, Spain). Each piece has undergone a natural process of marine abrasion and mechanical erosion over a prolonged geological period, resulting in a sub-spherical and ellipsoidal morphology with smooth-polished surface textures, free of sharp edges.
(Note on presentation: The pieces have been photographed on a black and damp background to highlight contrast, the saturation of their natural colors, and the internal structure of their veining.)
Petrological and Mineralogical Classification of the Lot:
The collection offers a representative sample of the region’s coastal geology, highlighting the following lithological families:
Siliceous Rocks (Quartz and Quartzite): High-hardness specimens (≈ 7 on the Mohs scale). They appear in translucent, milky varieties with iron oxide patinas that grant yellowish and orange tones.
Jaspers (Microcrystalline quartz variety): Clasts colored red and ochre due to microinclusions of hematite and other iron oxides. They exhibit the typical conchoidal fracture.
Plutonic Igneous Rocks (Granites): Fine- to medium-grained phaneritic texture. Visible composition of quartz, potassium feldspar (orthoclase) and micas (biotite/muscovite), producing the characteristic mottled or “checkerboard” texture.
Metamorphic and Sedimentary Rocks (Limestones/Schists): Fractures permanently sealed by secondary recrystallized white calcite veins, creating striking structural contrasts on gray and brown matrices.
Technical Data Sheet of the Lot
Geographic Origin: Alluvial and littoral deposits of the Costa Dorada, Mediterranean Sea (Spain).
Treatment: None. 100% natural specimens, washed exclusively with demineralized water to remove soluble salts (sulfates) and basic biological disinfection. No varnishes, oils, or synthetic waxes.
Condition: Excellent structural preservation. No recent fractures or mechanical exfoliation.
Applications: Natural history collecting, educational geology samples, aquatic landscaping (aquascaping), and minimalist or rustic interior design applications.
Total approximate weight: 1.1 kg (1100 grams).
Notice: This description was prepared with the help of artificial intelligence and may contain some errors in the description.
Batch of natural cobbles (clasts) – Costa Dorada, Spain – Mineralogical and Petrological Selection
Technical Description of the Lot
This lot consists of a selection of natural cobbles (continental clasts) collected on the coast of Costa Dorada (Tarragona, Spain). Each piece has undergone a natural process of marine abrasion and mechanical erosion over a prolonged geological period, resulting in a sub-spherical and ellipsoidal morphology with smooth-polished surface textures, free of sharp edges.
(Note on presentation: The pieces have been photographed on a black and damp background to highlight contrast, the saturation of their natural colors, and the internal structure of their veining.)
Petrological and Mineralogical Classification of the Lot:
The collection offers a representative sample of the region’s coastal geology, highlighting the following lithological families:
Siliceous Rocks (Quartz and Quartzite): High-hardness specimens (≈ 7 on the Mohs scale). They appear in translucent, milky varieties with iron oxide patinas that grant yellowish and orange tones.
Jaspers (Microcrystalline quartz variety): Clasts colored red and ochre due to microinclusions of hematite and other iron oxides. They exhibit the typical conchoidal fracture.
Plutonic Igneous Rocks (Granites): Fine- to medium-grained phaneritic texture. Visible composition of quartz, potassium feldspar (orthoclase) and micas (biotite/muscovite), producing the characteristic mottled or “checkerboard” texture.
Metamorphic and Sedimentary Rocks (Limestones/Schists): Fractures permanently sealed by secondary recrystallized white calcite veins, creating striking structural contrasts on gray and brown matrices.
Technical Data Sheet of the Lot
Geographic Origin: Alluvial and littoral deposits of the Costa Dorada, Mediterranean Sea (Spain).
Treatment: None. 100% natural specimens, washed exclusively with demineralized water to remove soluble salts (sulfates) and basic biological disinfection. No varnishes, oils, or synthetic waxes.
Condition: Excellent structural preservation. No recent fractures or mechanical exfoliation.
Applications: Natural history collecting, educational geology samples, aquatic landscaping (aquascaping), and minimalist or rustic interior design applications.
Total approximate weight: 1.1 kg (1100 grams).
Notice: This description was prepared with the help of artificial intelligence and may contain some errors in the description.
Details
Main mineral
Quartz
Mineral form
Tumbled
Weight
1.1 g
Origin (region/city)
Spanish Mediterranean Costa Dorada
Country of origin
Spain
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