Calcite

Crystal system · Trigonal

Calcite is a carbonate mineral prized by collectors for its exceptional color range, with several world-class Chinese localities.

Calcite mineral specimen from Daye Mine, Hubei, China

Grey prismatic calcite cluster from Daye Mine, Huangshi, Hubei

Cobaltoan calcite and hemimorphite pair from Yunnan, China

Rare yellow potato-shaped calcite cluster from China

Pink manganocalcite with blue hemimorphite from Guizhou Province, China

Yellow calcite crystal specimen from Hunan, China

Calcium carbonate, the most common carbonate mineral; trigonal/hexagonal.

About Calciteextended article

Calcite is the workhorse of the carbonate world — common, but capable of producing some of the most spectacular crystal habits in mineralogy. Chinese calcites from Hunan and Hubei rank among the largest and most aesthetic ever recovered.

Notable varieties

Iceland Spar (clear, double-refracting)
Manganocalcite (Mn-bearing pink)
Cobaltocalcite (deep magenta, Co-bearing)
Stalactitic / banded onyx-marble

The Chinese angle

Daye and Tonglushan mines in Hubei have produced museum-quality golden scalenohedral calcite crystals exceeding 30 cm. The Shangbao Mine in Hunan is famous for translucent orange "tooth" calcites perched on pyrite or fluorite matrices.

About Calcite

Calcite belongs to the carbonate class in the calcite group and has the chemical formula CaCO₃. It crystallizes in the trigonal system and is one of the most visually varied minerals in the collector market. Its combination of structural character and global distribution make it a recognized species in both systematic and aesthetic collections.

Identification & care

Specimens usually show rhombohedral, scalenohedral, prismatic, tabular, massive, stalactitic — over 300 documented crystal forms. Its color range is broad, including white, yellow, red, orange, blue, green, brown, gray, and colorless. The luster is vitreous, sub-vitreous, resinous, waxy, pearly, the streak is white, and specimens range from transparent to opaque. The cleavage is perfect rhombohedral {1011}. The fracture is conchoidal, which aids identification.

Collector context

How it forms

In terms of geology, Calcite forms in sedimentary (limestone, chalk), metamorphic (marble), hydrothermal veins; biogenic (shells, coral). It is commonly found in association with dolomite, fluorite, pyrite, quartz, barite.

Classic Chinese localities

Documented Chinese occurrences are recorded at Shangbao Mine, Jiama Cu-polymetallic deposit and Jinduicheng Mine, among others.

Why collectors care

Collectors pursue Calcite for the clarity of its crystal form and, in good material, saturated color that reads instantly across a display case. A well-terminated calcite on clean matrix photographs well, identifies quickly, and anchors a cabinet piece. Top Chinese specimens over the last two decades have reset the bar for what calcite looks like at collector grade.

What affects value

Value in Calcite is assessed, in typical order of weight, against: (1) locality provenance; (2) size relative to the species norm; (3) crystal form and termination sharpness; (4) color saturation and zoning; (5) transparency and internal clarity; (6) matrix quality and aesthetic balance; (7) condition (absence of damage, chips, or repair). Cleaning quality and verified locality documentation act as multipliers across the above.

Naming history

The name Calcite has a specific etymological and historical context — see Mindat's reference entry for provenance details. We have retained naming data at the record level; published prose is paraphrased from factual fields rather than copied from source.