Quartz Tumbled- 1.1 g
08
days
22
hours
02
minutes
38
seconds
No bids placed
Catawiki Buyer Protection
Your payment’s safe with us until you receive your object.View details
Trustpilot 4.4 | 138166 reviews
Rated Excellent on Trustpilot.
Polished quartz cobbles, a natural rock lot from the Costa Dorada coast, Spain, weighing about 1.1 kg.
AI-assisted summary
Description from the seller
Lot of natural cobbles (clasts) – Costa Dorada, Spain – Mineralogical and petrographic selection
Technical Description of the Lot
This lot is composed of a selection of cobbles (continental clasts) collected on the shore of the 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 for presentation: The pieces have been photographed on a black, wet background to highlight contrast, the saturation of their natural colors, and the internal structure of their veins).
Petrographic 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 Chert): Specimens of high hardness (~7 on the Mohs scale). They appear in translucent, milky varieties and with iron oxide patinas that grant yellowish and orange tones.
Jaspers (Microcrystalline Quartz variety): Clasts colored red and ochre due to microinclusions of hematites and other iron oxides. They exhibit the typical concoidal fracture.
Plutonic Igenous Rocks (Granites): Phaneritic texture of medium-fine grain. Visible composition of quartz, potassic feldspar (orthoclase) and micas (biotite/muscovite), yielding the characteristic mottled appearance or “checkerboard texture.”
Metamorphic and Sedimentary Rocks (Limestones/Schists): Fractures sealed secondarily by veins of recrystallized calcite in white tones, creating striking structural contrasts over 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 only with demineralized water to remove soluble salts (saltpeter) and provide basic biological disinfection. No varnishes, oils, or synthetic waxes.
Condition: Excellent structural conservation. No recent fractures or mechanical spalling.
Applications: Natural history collecting, educational geology samples, aquatic landscaping (aquascaping) and interior design applications in minimalist or rustic styles.
Total approximate weight: 1.1 kg (1100 grams).
Notice: This description was prepared with the help of artificial intelligence and may contain some inaccuracies in the description.
Lot of natural cobbles (clasts) – Costa Dorada, Spain – Mineralogical and petrographic selection
Technical Description of the Lot
This lot is composed of a selection of cobbles (continental clasts) collected on the shore of the 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 for presentation: The pieces have been photographed on a black, wet background to highlight contrast, the saturation of their natural colors, and the internal structure of their veins).
Petrographic 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 Chert): Specimens of high hardness (~7 on the Mohs scale). They appear in translucent, milky varieties and with iron oxide patinas that grant yellowish and orange tones.
Jaspers (Microcrystalline Quartz variety): Clasts colored red and ochre due to microinclusions of hematites and other iron oxides. They exhibit the typical concoidal fracture.
Plutonic Igenous Rocks (Granites): Phaneritic texture of medium-fine grain. Visible composition of quartz, potassic feldspar (orthoclase) and micas (biotite/muscovite), yielding the characteristic mottled appearance or “checkerboard texture.”
Metamorphic and Sedimentary Rocks (Limestones/Schists): Fractures sealed secondarily by veins of recrystallized calcite in white tones, creating striking structural contrasts over 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 only with demineralized water to remove soluble salts (saltpeter) and provide basic biological disinfection. No varnishes, oils, or synthetic waxes.
Condition: Excellent structural conservation. No recent fractures or mechanical spalling.
Applications: Natural history collecting, educational geology samples, aquatic landscaping (aquascaping) and interior design applications in minimalist or rustic styles.
Total approximate weight: 1.1 kg (1100 grams).
Notice: This description was prepared with the help of artificial intelligence and may contain some inaccuracies 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
Sold by
