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:

Borates
boracite
borax
colemanite
ericaite
fluoborite
fredrikssonite
hambergite
hilgardite
hulsite
hydroboracite
hydroxylborite
inderborite
inderite
inyoite
jimboite
kernite
kotoite
ludwigite
meyerhofferite
nifontovite
nordenskiöldine
pentahydroborite
priceite
sakhaite
sibirskite
sinhalite
studenitsite
suanite
sussexite
szaibelyite
tincalconite
trembathite
ulexite
volkovskite
vonsenite
warwickite
wiserite

Phosphates
seamanite

Borosilicates
grandidierite
serendibite
tinzenite

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