Jeremejevite
Jeremejevite is a borate mineral prized by collectors for its exceptional color range.
About Jeremejevite
Jeremejevite is a borate mineral in the jeremejevite group and has the chemical formula Al6B5O15(F,OH)3. It crystallizes in the hexagonal 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
Jeremejevite typically forms elongated hexagonal prismatic crystals, often with complex terminations; sometimes short prismatic. Its color range is broad, including colorless, pale blue, pale yellow, pale lilac-blue, and gem quality: ice-blue to cornflower-blue. The luster is vitreous, the streak is white, and specimens range from transparent to translucent. The fracture is conchoidal, which is one of its key identifying features.
Collector context
How it forms
Jeremejevite forms in granitic pegmatites (relatively rare occurrence even there); cape cross specimens occur in pegmatite veins in granite. It is commonly found in association with quartz, feldspar, tourmaline, apatite.
Why collectors care
Jeremejevite is a frequently-sought species in serious collections because its habit is recognizable, its color often strong, and its best examples unmistakable even at a distance. Chinese material has driven much of the recent visual shift in the species — sharper crystals, deeper colors, cleaner matrix.
What affects value
Value in Jeremejevite 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 Jeremejevite 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.