Londonite
A variety of Minerals
What is Londonite?
The borate minerals are minerals which contain a borate anion group. The borate (BO3) units may be polymerised similar to the SiO4 unit of the silicate mineral class. This results in B2O5, B3O6, B2O4 anions as well as more complex structures which include hydroxide or halogen anions. The [B(O,OH)4] anion exists as well. Many borate minerals, such as borax, colemanite, and ulexite, are salts: soft, readily soluble, and found in evaporite contexts. However, some, such as boracite, are hard and resistant to weathering, more similar to the silicates. There are over 100 different borate minerals. Borate minerals include: Kernite Na2B4O6(OH)2·3H2O Borax Na2B4O5(OH)4·8H2O Ulexite NaCaB5O6(OH)6·5H2O Colemanite CaB3O4(OH)3·H2O Boracite Mg3B7O13Cl Painite CaZrAl9O15(BO3)
Optical Properties
- Optical Character
- Isotropic
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Londonite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Londonite Localities Map
See where Londonite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Milky white to pale yellow, yellow
- Hardness (Mohs)
- 8
- Density
- 3.42 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- (Cs,K,Rb)Al4Be4(B,Be)12O28
- Elements
- Al, B, Be, Cs, K, O, Rb
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Londonite FAQs
How do I identify Londonite?
Londonite can be identified by its hardness of 8 on the Mohs scale, Milky white to pale yellow color. Look for these key characteristics when examining specimens.
What color is Londonite?
Londonite typically appears in Milky white to pale yellow, yellow. Color can vary depending on impurities and formation conditions.
How hard is Londonite?
Londonite has a hardness of 8 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.
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