"Dessus de bouchon"

Premium introductory collection features 12 palm-sized specimens that depict the variety of colors and forms found in minerals. Each specimen is numbered and keyed to an ID sheet featuring additional data about each item. Includes an information booklet and a magnifier.

Classroom Collection of Rocks and Minerals Designed for General Classroom Use

Identify all six crystal systems (cubic, tetragonal, orthorhombic, monoclinic, triclinic and hexagonal) with the 15 representative specimens of natural crystals included in this collection. In compartmented box with key sheet listing the locality and crystal form of each specimen.

Demonstrate the vivid contrasting colors of fifteen specimens when illuminated under shortwave ultraviolet light. Some specimens are also long wave reactive. Specimen average size: 1" x 1". Comes in compartmented box with key sheet.

The Universal Specific Gravity Kit is designed to be used with any electronic scale with a minimum capacity of 15 grams and a tare (re-zeroing) function to easily measure the specific gravity of gemstones and minerals.
Just weigh the stone "in air" on the integrated weighing platform of the scale, then without changing the setup, weigh the stone in water by placing it in the underwater weighing pan of the gem holder suspended above the platform. Plug the two values into the specific gravity equation and obtain the specific gravity of your stone.

Includes: lightweight gem holder support and underwater weighing pan, independent, spill-resistant, adjustable beaker support, beaker for filling with water - 100ml capacity, aluminum test weight, stainless steel tweezers, instructions, reproducible Specific Gravity worksheet, table of 300 common minerals/gems sorted by SG, with 6 other properties, including refractive index.

Note: shown with Boreal Balance - not included.

Beautiful, violet-pink cleavage books of this uncommon lithium mica.

Beautiful deep green, prismatic, crystalline spray.

Hardened natural cement of calcium carbonate that binds other material such as gravel, sand, clay, and silt.

Deep purple, cubic crystal cluster.

Sharp, brown, twinned, orthorhombic, ³/₈– ¹/₂".

Polished banded slices with colorful translucence.

Beautiful, blue, hexagonal, sapphire crystals. Average size: 3/8". Madagascar.

Sparkling pale blue transparent crystals in vug-like matrix. Average size: 2" x 2". Madagascar.

Brilliant blue lab-grown copper sulfate crystal group. Average size: 2" x 2". Poland.

Spain