Quartz Tumbled- 1.1 g
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Polished quartz pebbles lot from the Costa Dorada coast, Spain, weighing about 1.1 kg.
AI-assisted summary
Description from the seller
Batch of natural pebbles (clasts) – Costa Dorada, Spain – Mineralogical and petrological selection
Technical Description of the Batch
This batch is composed of a selection of pebbles (continental clasts) collected along the coast of Costa Dorada (Tarragona, Spain). Each piece has undergone a natural process of marine abrasion and mechanical erosion over a prolonged geologic period, resulting in a sub-spherical and ellipsoidal morphology with smooth-polished textured surfaces and no sharp edges.
(Presentation note: The pieces have been photographed on a black, wet background to highlight the contrast, saturation of their natural colors and the internal structure of their veins).
Petrological and Mineralogical Classification of the Batch:
The collection offers a representative sample of the region's coastal geology, highlighting the following lithological families:
Siliceous Rocks (Quartz and Chert): Specimens of high hardness (~7 on the Mohs scale). They appear in translucent, milky varieties with iron oxide patinas that give them yellowish and orange tones.
Jaspers (Microcrystalline variety of Quartz): Clasts colored red and ochre due to microinclusions of hematites and other iron oxides. They exhibit conchoidal fracture.
Plutonic Igneous Rocks (Granites): Fine- to medium-grained phaneritic texture. Visible composition of quartz, potassium feldspar (orthoclase) and micas (biotite/muscovite), yielding the characteristic mottled or checkered texture.
Metamorphic and Sedimentary Rocks (Limestones/Schists): Fractures sealed secondarily by veins of recrystallized white calcite, creating striking structural contrasts over gray and brown matrices.
Technical Sheet of the Batch
Geographic Origin: Alluvial and coastal deposits of the Costa Dorada, Mediterranean Sea (Spain).
Treatment: None. Specimens 100% natural, washed only with demineralized water to remove soluble salts (nitrate) and basic biological disinfection. No varnishes, oils or synthetic waxes.
Status: Excellent structural conservation. 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).
Note: This description was prepared with the help of artificial intelligence and may contain some errors in the description.
Batch of natural pebbles (clasts) – Costa Dorada, Spain – Mineralogical and petrological selection
Technical Description of the Batch
This batch is composed of a selection of pebbles (continental clasts) collected along the coast of Costa Dorada (Tarragona, Spain). Each piece has undergone a natural process of marine abrasion and mechanical erosion over a prolonged geologic period, resulting in a sub-spherical and ellipsoidal morphology with smooth-polished textured surfaces and no sharp edges.
(Presentation note: The pieces have been photographed on a black, wet background to highlight the contrast, saturation of their natural colors and the internal structure of their veins).
Petrological and Mineralogical Classification of the Batch:
The collection offers a representative sample of the region's coastal geology, highlighting the following lithological families:
Siliceous Rocks (Quartz and Chert): Specimens of high hardness (~7 on the Mohs scale). They appear in translucent, milky varieties with iron oxide patinas that give them yellowish and orange tones.
Jaspers (Microcrystalline variety of Quartz): Clasts colored red and ochre due to microinclusions of hematites and other iron oxides. They exhibit conchoidal fracture.
Plutonic Igneous Rocks (Granites): Fine- to medium-grained phaneritic texture. Visible composition of quartz, potassium feldspar (orthoclase) and micas (biotite/muscovite), yielding the characteristic mottled or checkered texture.
Metamorphic and Sedimentary Rocks (Limestones/Schists): Fractures sealed secondarily by veins of recrystallized white calcite, creating striking structural contrasts over gray and brown matrices.
Technical Sheet of the Batch
Geographic Origin: Alluvial and coastal deposits of the Costa Dorada, Mediterranean Sea (Spain).
Treatment: None. Specimens 100% natural, washed only with demineralized water to remove soluble salts (nitrate) and basic biological disinfection. No varnishes, oils or synthetic waxes.
Status: Excellent structural conservation. 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).
Note: 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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