Arsenic

cinnabar

realgar

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Formula: As
Native element, forms a series with antimony
Specific gravity: 5.6 to 5.8
Hardness: 3½
Streak: Tin-white
Colour: Tin-white, tarnishing to dark grey or black
Solubility: On heating arsenic sublimes without melting
Common impurities: Bi,Sb,Fe,Ni,Ag,S,Se
Environments:

Hydrothermal environments

Arsenic occurs in hydrothermal veins and deposits that contain other arsenic minerals, sometimes in cobalt-silver sulphide veins. (HOM) It oxidises slowly in air and is then covered with a thin crust of tiny arsenolite crystals (Mindat). Associated minerals include arsenolite, cinnabar, realgar, orpiment, stibnite, galena, sphalerite, pyrite and baryte. (HOM)

At Llallagua, Bolivia, arsenic has been identified in a specimen consisting of alternating lamellae of native arsenic, realgar and gypsum, probably formed by the oxidation of arsenopyrite. (MinRec 37.2.126)

Arsenic-bearing minerals include:

Alloys
stibarsen

Sulphides
cobaltite
duranusite
glaucodot
hollingworthite
lautite
pääkkönenite
realgar
wakabayashilite

Arsenides
algodonite
clinosafflorite
domeykite
isomertieite
koutekite
krutovite
kutinaite
nickeline
nickelskutterudite
novákite
orcelite
paxite
rammelsbergite
skutterudite
sperrylite

Sulpharsenides
arsenopyrite
baumhauerite

Sulphosalts
Sulphosalt minerals are complex sulphide minerals with the general formula AmBnSp, where A represents a metal, B usually represents a semi-metal such as arsenic, and S is sulphur or rarely selenium or/and tellurium. In sulpharsenides the arsenic substitutes for sulphur whereas in the sulphosalts the arsenic substitutes for a metal cation (Wiki).

aktashite
chabournéite
dufrénoysite
enargite
geocronite
guettardite
jordanite
kirkiite
laffittite
luzonite
madocite
pearceite
playfairite
polybasite
proustite
quadratite
rathite
sartorite
seligmannite
smithite
sorbyite
sterryite
tennantite
tsugaruite
twinnite
xanthoconite

Oxides
arsenolite
claudetite
karibibite

Arsenates
adamite
adelite
agardite
allactite
annabergite
arseniosiderite
arsenoclasite
arsenocrandallite
arsentsumebite
arsenuranylite
arthurite
asselbornite
atelestite
austinite
bariopharmacosiderite
bayldonite
bergslagite
berzeliite
beudantite
brandtite
brassite
bulachite
cahnite
carminite
caryinite
chalcophyllite
chenevixite
chernovite-(Y)
chlorophoenicite
chudobaite
claraite
clinoclase
cobaltarthurite
cobaltaustinite
cobaltkoritnigite
cobaltlotharmeyerite
conichalcite
cornubite
cornwallite
duftite
dussertite
erythrite
euchroite
eveite
fahleite
feinglosite
ferrilotharmeyerite
ferrarisite
flinkite
fluckite
fornacite
gaitite
gartrellite
geminite
gerdtremmelite
goudeyite
grischunite
haidingerite
hedyphane
helmutwinklerite
hematolite
hidalgoite
holdenite
hornesite
ianbruceite
irhtemite
jarosewichite
johillerite
johnbaumite
keyite
kolicite
koritnigite
köttigite
kraisslite
lammerite
lavendulan
legrandite
lemanskiite
lindackerite
liroconite
luetheite
lukrahnite
manganberzeliite
mansfieldite
mawbyite
metaköttigite
metanováčekite
metauranospinite
metazeunerite
mimetite
mixite
molybdofornacite
nováčekite
o'danielite
ojuelaite
olivenite
parabrandtite
paradamite
parasymplesite
parnauite
pharmacoalumite
pharmacolite
pharmacosiderite
phaunouxite
philipsbornite
philipsburgite
picropharmacolite
pitticite
preisingerite
prosperite
pushcharovskite
rauenthalite
retzian
rooseveltite
roselite
rösslerite
sainfeldite
sarkinite
scorodite
segnitite
smolyaninovite
stranskiite
strashimirite
svabite
symplesite
synadelphite
talmessite
tetrarooseveltite
thometzekite
tilasite
trögerite
tsumcorite
tyrolite
uranospinite
wallkilldellite
walpurgite
warikahnite
weilite
wendwilsonite
yanomamite
yukonite
yvonite
zálesíite
zincgartrellite
zincolivenite
zincroselite

Arsenites
reinerite
schneiderhöhnite

Antimonates
manganostibite

Arsenites
dixenite
finnemanite
leiteite
ludlockite
magnussonite
reinerite
rouseite
schneiderhöhnite
trigonite

Molybdates
betpakdalite

Sorosilicates
tiragalloite

Phyllosilicates
nelenite

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