boralsilite
A monoclinic-prismatic mineral containing aluminum, boron, oxygen, and silicon.

borcarite
A monoclinic-prismatic mineral containing boron, calcium, carbon, hydrogen, magnesium, and oxygen.

borickite
Synonym of delvauxite.

borickites
plural of borickite

borishanskiite
An orthorhombic-pyramidal gray mineral containing arsenic, lead, and palladium.

bornemanite
A monoclinic-domatic light yellow mineral containing barium, fluorine, hydrogen, manganese, niobium, oxygen, phosphorus, potassium, silicon, sodium, and titanium.

bornhardtite
An isometric-hexoctahedral mineral containing cobalt and selenium.

borodaevite
A monoclinic-prismatic gray mineral containing antimony, bismuth, silver, and sulfur.

boromuscovite
A monoclinic-prismatic mineral containing aluminum, boron, fluorine, hydrogen, oxygen, potassium, and silicon.

boronatrocalcite
Synonym of ulexite.

boronatrocalcites
plural of boronatrocalcite

borovskite
An isometric-hexoctahedral dark gray mineral containing antimony, palladium, and tellurium.

bosjemanite
Synonym of pickeringite.

bostwickite
An orthorhombic dark red mineral containing calcium, hydrogen, manganese, oxygen, and silicon.

botryolite
A variety of datolite, usually having a botryoidal structure.

bottinoite
A trigonal-pyramidal mineral containing antimony, hydrogen, nickel, and oxygen.

bournonite
A sulfosalt mineral, a sulfantimonite of lead and copper.

bournonites
plural of bournonite

boussingaultite
A monoclinic-prismatic mineral containing hydrogen, magnesium, nitrogen, oxygen, and sulfur.

bowenite
A hard, compact variety of the serpentine species antigorite.

bowenites
plural of bowenite

bowlingite
saponite.

boyleite
A monoclinic-prismatic white mineral containing hydrogen, magnesium, oxygen, sulfur, and zinc.

brabantite
A monoclinic-sphenoidal mineral containing calcium, oxygen, phosphorus, and thorium.

bracewellite
An orthorhombic-dipyramidal mineral containing chromium, hydrogen, and oxygen.

brachinite
An achondrite found in some asteroids

brachypinacoid
A plane of an orthorhombic crystal which is parallel both to the vertical axis and to the shorter lateral (brachydiagonal) axis.

brachypinacoids
plural of brachypinacoid

brackebuschite
A monoclinic-prismatic mineral containing hydrogen, iron, lead, manganese, oxygen, vanadium, and zinc.

bradaczekite
A monoclinic-prismatic dark blue mineral containing arsenic, copper, oxygen, sodium, and zinc.

bradleyite
A monoclinic-prismatic mineral containing carbon, magnesium, oxygen, phosphorus, and sodium.

braggite
A tetragonal-dipyramidal steel gray mineral containing nickel, palladium, platinum, and sulfur.

brait
A diamond in the rough; an uncut diamond.

braits
plural of brait

brammallite
A sodium-rich analogue of illite.

brandholzite
A trigonal-pyramidal colorless mineral containing antimony, hydrogen, magnesium, and oxygen.

brandtite
A monoclinic-prismatic mineral containing arsenic, calcium, hydrogen, magnesium, manganese, and oxygen.

brannerite
A monoclinic-prismatic mineral containing calcium, cerium, iron, oxygen, titanium, and uranium.

brannockite
A hexagonal-dihexagonal dipyramidal colorless mineral containing lithium, oxygen, potassium, silicon, and tin.

bravoite
A nickel-bearing variety of pyrite.

bravoites
plural of bravoite

bredigite
An orthorhombic-pyramidal mineral containing calcium, magnesium, oxygen, and silicon.

brendelite
A monoclinic-prismatic mineral containing bismuth, hydrogen, iron, lead, oxygen, and phosphorus.

brenkite
An orthorhombic-dipyramidal colorless mineral containing calcium, carbon, fluorine, and oxygen.

breunnerite
A type of magnesite with a magnesium/iron ratio of 90/10 to 70/30.

breunnerites
plural of breunnerite.

brezinaite
A monoclinic-prismatic brownish gray mineral containing chromium and sulfur.

brianroulstonite
A monoclinic-domatic mineral containing boron, calcium, chlorine, hydrogen, and oxygen.

brianyoungite
A monoclinic-prismatic colorless mineral containing carbon, hydrogen, oxygen, sulfur, and zinc.

brifka
a small folding envelope used for keeping diamonds or other gemstones in
by extension a gem envelope including its contents

brifkas
plural of brifka

brilliants
plural of brilliant

brindleyite
A monoclinic-sphenoidal yellow green mineral containing aluminum, hydrogen, iron, magnesium, nickel, oxygen, and silicon.

brinrobertsite
A monoclinic-prismatic mineral containing aluminum, calcium, hydrogen, iron, magnesium, oxygen, potassium, silicon, and sodium.

briolette
An oval or pear-shaped diamond having its entire surface cut in triangular facets.

briolettes
plural of briolette

brizziite
A mineral containing sodium, antimony and oxygen that is found in Europe.

brocchite
Synonym of chondrodite.

brockite
A hexagonal-trapezohedral mineral containing calcium, cerium, hydrogen, oxygen, phosphorus, and thorium.

brockram
A basal breccia of cemented limestone and sandstone fragments dating from the Permian period, found in northern England.

brockrams
plural of brockram

brodtkorbite
A monoclinic-prismatic dark gray mineral containing copper, mercury, and selenium.

bromlite
The mineral alstonite.

brongniardite
A lead-silver sulfantimonide with 26.2% silver, some of which is apparently diaphorite and some canfieldite.

brongniartite
Alternative spelling of brongniardite.

bronzite
A ferriferous variety of enstatite, often with a bronze-like lustre.

bronzites
plural of bronzite

bronzitite
A form of orthopyroxenite composed mostly of the mineral hypersthene

bronzitites
plural of bronzitite

brotocrystal
A phenocryst whose corroded or embayed outline proves that it was formed prior to the eruptive stage.

brotocrystals
plural of brotocrystal

brunckite
Synonym of schalenblende.

brunogeierite
An isometric-hexoctahedral mineral containing germanium, iron, and oxygen.

brunsvigite
Synonym of chamosite.

brushite
A mineral formed by the interaction of guano with calcite and clay at a low pH, believed to be a precursor of apatite.

bruxite
Synonym of bauxite.

bruxites
plural of bruxite

bucholzite
Sillimanite.

buchwaldite
An orthorhombic-pyramidal white mineral containing calcium, oxygen, phosphorus, and sodium.

buckhornite
An orthorhombic-dipyramidal black mineral containing bismuth, gold, lead, sulfur, and tellurium.

bugdi
A type of ear ornament typically worn on the upper helix of the ear. They are often small and delicate, featuring intricate designs, gemstones, or pearls. They can be made from various materials like gold, silver, or even oxidized metals.

bugdis
plural of bugdi

bukovite
A tetragonal-ditetragonal dipyramidal mineral containing copper, iron, selenium, and thallium.

bulachite
An orthorhombic mineral containing aluminum, arsenic, hydrogen, and oxygen.

bultfonteinite
A triclinic-pinacoidal mineral containing calcium, fluorine, hydrogen, oxygen, and silicon.

burangaite
A monoclinic-prismatic mineral containing aluminum, calcium, hydrogen, iron, magnesium, oxygen, phosphorus, and sodium.

burbankite
A hexagonal-dihexagonal dipyramidal mineral containing barium, calcium, carbon, cerium, oxygen, sodium, and strontium.

burbankites
plural of burbankite

burckhardtite
A monoclinic mineral containing aluminum, hydrogen, iron, lead, manganese, oxygen, silicon, and tellurium.

burnsite
A hexagonal-dihexagonal dipyramidal dark red mineral containing cadmium, chlorine, copper, oxygen, potassium, and selenium.

burpalite
A monoclinic-prismatic mineral containing calcium, fluorine, oxygen, silicon, sodium, and zirconium.

burtite
A trigonal-rhombohedral colorless mineral containing calcium, hydrogen, oxygen, and tin.

buryatite
A trigonal-ditrigonal pyramidal light violet gray mineral containing aluminum, boron, calcium, hydrogen, iron, oxygen, silicon, and sulfur.

bushmakinite
A monoclinic-prismatic bright yellow mineral containing aluminum, chromium, copper, hydrogen, lead, oxygen, phosphorus, sulfur, vanadium, and zinc.