QUARTZ & FLUORITE – Purple-Coated Double Milky Quartz, Inner Mongolia, China

Two Quartz Crystals Dressed in Purple

This unusual specimen is a double crystal of Milky Quartz from Inner Mongolia, China, completely wrapped in a thin coat of purple Fluorite. Two elongated prismatic crystals grew side by side; the taller one ends in a clean pyramidal termination, while the shorter one shows a flat top. Seen from the front, the pair looks like a small purple sculpture rather than ordinary quartz.

A Sparkling Fluorite Coat

The fluorite does not form large cubes here: it grew as a dense drusy crust of tiny crystals that follows every face and edge of the quartz. Under light, these micro-crystals sparkle like sugar, and the color is an even, saturated violet over almost the whole surface, with a few lighter flecks where the white quartz shows through.

The White Quartz Core

Where the crystals were detached from their base, the inside is visible: a milky white quartz core under the purple skin. This contrast between the white heart and the violet surface is the most interesting detail of the piece and clearly shows the order in which the two minerals formed: first the quartz, then the fluorite that covered it like a second skin.

A New Find from Inner Mongolia

Quartz overgrown by purple fluorite in this way is a new find on the mineral market. Inner Mongolia is one of the most important fluorite regions in the world, known for its purple, green and blue specimens from deposits such as the Huanggang mine in Hexigten Banner and the Bayan Obo district. With its compact size, easy to place on any shelf or in a display case, and its bold color, this piece is ideal for a collection of Chinese minerals, for a fluorite or quartz collection, or simply for display.

What Gives the Colors

The core of this specimen is quartz, silicon dioxide (SiO2), whose milky white color comes from microscopic fluid inclusions that scatter light. The coating is fluorite, calcium fluoride (CaF2). Pure fluorite is colorless; its purple color is caused by color centers created when natural radiation acts on the crystal lattice, often helped by traces of rare-earth elements such as yttrium replacing calcium.

Crystal Structure

Quartz belongs to the trigonal system and forms hexagonal prisms with pyramidal terminations, as seen on the taller crystal. Fluorite is cubic (isometric); here it formed a dense crust of tiny crystals that copies the shape of the quartz underneath instead of growing large cubes.

Formation and Fluorescence

The quartz crystallized first from hydrothermal fluids; later, fluorine-rich fluids deposited fluorite over all of its faces. Although many fluorites glow under ultraviolet light, the fluorite on this specimen is non-fluorescent or at most very weakly fluorescent under long-wave UV (365 nm).

Hardness and Care

The two minerals behave very differently. Quartz is hard (7 on the Mohs scale) and has no cleavage, while fluorite is much softer (4) and has a perfect octahedral cleavage, so the purple coat can chip if knocked. Keep the specimen away from hard objects and clean it only with a soft brush and lukewarm water.

• Formula: SiO2 (Quartz); CaF2 (Fluorite)
• Key chemical elements: Silicon, Oxygen, Calcium, Fluorine
• Hardness (Mohs scale): 7 (Quartz); 4 (Fluorite)
• Mineral class: Silicates/Oxides (Quartz); Halides (Fluorite)
• Crystal system: Trigonal (Quartz); Cubic (Fluorite)
• Crystal habit: Double prismatic crystal (Quartz) with a drusy coating (Fluorite)
• Formation: Hydrothermal
• Color: Milky white core (Quartz); deep purple coating (Fluorite)
• Fluorescence: Non-fluorescent to very weak under LW 365 nm

Fluorite Named Fluorescence

The phenomenon of fluorescence takes its name from fluorite. In 1852 the physicist George Gabriel Stokes coined the word after studying how some fluorite crystals glow under ultraviolet light.

A Mineral That Helps Metals Flow

The name fluorite comes from the Latin fluere, to flow, because the mineral was added to furnaces as a flux to help ores melt at lower temperatures. It is still a key raw material for steelmaking, for aluminium production and for the chemical industry, where it is the main source of fluorine.

China and Its Fluorite

China is the world's largest producer of fluorite, and Inner Mongolia is one of its main mining regions. The same area hosts Bayan Obo, the largest rare-earth deposit on Earth, where fluorite is one of the most abundant gangue minerals.

Milky Quartz, a Common Mineral with a Story

Milky quartz is the most widespread form of quartz. In many old mining districts, prospectors followed white quartz veins because they can host gold and other metals, so this humble mineral has guided the search for ore for centuries.

Meaning in Crystal Healing

Milky Quartz and purple Fluorite are traditionally associated with calm and mental clarity. Quartz is believed to soothe and harmonize a space, while fluorite is said to help order the thoughts and support concentration during study and work.

Color and Chakra Associations

The deep violet of this piece from Inner Mongolia links it to the Third Eye chakra, associated with intuition, and its white quartz heart to the Crown chakra. Together they are said to bring a calm, focused and balanced state of mind.

These interpretations are not scientifically proven.

Chakra: Third Eye, Crown

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