Boron

boron

kernite

borax

colemanite

Formula: B
Element, metalloid, does not occur in the native state on Earth, although it has been identified from the moon
Specific gravity: 2.34
Colour: Black
Solubility: Insoluble in nitric and hydrochloric acids
Melting point: 2075oC
Boiling point: 3727oC
Abundance in the Earth’s crust: 10 parts per million by mass, 1 part per million by moles
Abundance in the Solar System: 2 parts per billion by mass, 0.2 parts per billion by moles
Boron compounds are usually found in sediments and sedimentary rock formations. The chief sources of boron are kernite, borax and colemanite. In compounds boron almost always occurs as trivalent B3+ (ChC)

Boron-bearing minerals include:

Halides
barberiite

Borates
bandylite
berborite
bonaccordite
boracite
borax
borcarite
calciborite
colemanite
congolite
ericaite
fluoborite
fredrikssonite
frolovite
gaudefroyite
hambergite
hilgardite
howlite
hulsite
hydroboracite
hydroxylborite
inderborite
inderite
inyoite
jimboite
kernite
kotoite
kurnakovite
ludwigite
meyerhofferite
nifontovite
nordenskiöldine
olshanskyite
parasibirskite
pentahydroborite
priceite
probertite
pseudosinhalite
sakhaite
sibirskite
sinhalite
strontioginorite
studenitsite
suanite
sussexite
szaibélyite
tincalconite
takedaite
trembathite
tunellite
ulexite
volkovskite
vonsenite
warwickite
wiserite

Phosphates
seamanite

Sulphates
tatarinovite

Borosilicates
chromium-dravite
darrellhenryite
dravite
fluor-liddicoatite
fluor-schorl
fluor-uvite
grandidierite
hellandite-(Y)
kornerupine
lisitsynite
magnesio-foitite
maruyamaite
melanocerite-(Ce)
ominelite
oxy-dravite
oyelite
princivalleite
schorl
searlesite
serendibite
stillwellite-(Ce)
tienshanite
tinzenite
titantaramellite
werdingite

Nesosilicates
arrheniusite-(Ce)

Inosilicates
hellandite-(Ce)

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