rivadavite
A monoclinic-prismatic mineral containing boron, hydrogen, magnesium, oxygen, and sodium.

riversideite
An orthorhombic-disphenoidal white mineral containing calcium, hydrogen, oxygen, and silicon.

roaldite
An isometric-hextetrahedral tin white mineral containing iron, nickel, and nitrogen.

robertsite
A monoclinic-prismatic mineral containing calcium, hydrogen, manganese, oxygen, and phosphorus.

robinsonite
A monoclinic-prismatic bluish lead gray mineral containing antimony, lead, and sulfur.

rockallite
A relatively dark, iron-rich peralkaline granite forming part of the islet of Rockall.

rockbridgeite
An orthorhombic-dipyramidal mineral containing hydrogen, iron, manganese, oxygen, and phosphorus.

rocksalt
Alternative spelling of rock salt.

rockwood
ligniform asbestos
fossil wood

rodalquilarite
A triclinic mineral containing chlorine, hydrogen, iron, oxygen, and tellurium.

rodolicoite
A trigonal-trapezohedral mineral containing iron, oxygen, and phosphorus.

roeblingite
A monoclinic-prismatic mineral containing calcium, hydrogen, lead, oxygen, silicon, and sulfur.

roedderite
A hexagonal-dihexagonal dipyramidal mineral containing iron, magnesium, oxygen, potassium, silicon, and sodium.

roepperite
A manganoan variety of fayalite.

roestone
oolite, or a variation of it

roestones
plural of roestone

roggianite
A tetragonal-ditetragonal dipyramidal mineral containing aluminum, beryllium, calcium, hydrogen, oxygen, and silicon.

rohaite
An orthorhombic-dipyramidal steel gray mineral containing antimony, copper, sulfur, and thallium.

rollandite
A orthorhombic mineral containing astatine, hydrogen, oxygen, and copper.

romanzovite
A brownish variety of grossular.

romarchite
A tetragonal-ditetragonal dipyramidal black mineral containing oxygen and tin.

rondorfite
An isometric-diploidal mineral containing aluminum, calcium, chlorine, hydrogen, iron, magnesium, oxygen, silicon, sodium, and titanium.

ronneburgite
A monoclinic-prismatic reddish brown mineral containing magnesium, manganese, oxygen, potassium, and vanadium.

rooseveltite
A monoclinic-prismatic mineral containing arsenic, bismuth, and oxygen.

roquesite
A tetragonal-scalenohedral gray mineral containing copper, indium, and sulfur.

rorisite
A tetragonal-ditetragonal dipyramidal colorless mineral containing calcium, chlorine, fluorine, and magnesium.

rosasite
A monoclinic-prismatic mineral containing carbon, copper, hydrogen, oxygen, and zinc.

roscherite
A triclinic-pinacoidal mineral containing beryllium, calcium, hydrogen, iron, manganese, oxygen, and phosphorus.

roscoelite
A monoclinic-prismatic mineral containing aluminum, hydrogen, magnesium, oxygen, potassium, silicon, and vanadium.

roselite
A monoclinic-prismatic mineral containing arsenic, calcium, cobalt, hydrogen, magnesium, and oxygen.

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

rosenbuschite
A triclinic-pinacoidal mineral containing calcium, fluorine, oxygen, silicon, sodium, titanium, and zirconium.

rosenhahnite
A triclinic-pinacoidal mineral containing calcium, carbon, hydrogen, oxygen, and silicon.

roshchinite
An orthorhombic-dipyramidal mineral containing antimony, arsenic, copper, lead, silver, and sulfur.

rosiaite
A trigonal-hexagonal scalenohedral mineral containing antimony, lead, and oxygen.

rosickyite
A monoclinic-prismatic mineral containing sulfur.

rosolite
A rose pink variety of grossular; rose garnet.

rossite
A triclinic-pinacoidal yellow mineral containing calcium, hydrogen, oxygen, and vanadium.

rossmanite
A trigonal-ditrigonal pyramidal mineral containing aluminum, boron, hydrogen, lithium, oxygen, and silicon.

rostite
An orthorhombic-dipyramidal white mineral containing aluminum, fluorine, hydrogen, oxygen, and sulfur.

rouaite
A monoclinic-sphenoidal dark emerald green mineral containing copper, hydrogen, nitrogen, and oxygen.

roubaultite
A triclinic-pinacoidal mineral containing carbon, copper, hydrogen, oxygen, and uranium.

rouseite
A triclinic yellow orange mineral containing arsenic, hydrogen, lead, manganese, and oxygen.

routhierite
A tetragonal-ditetragonal pyramidal mineral containing antimony, arsenic, copper, mercury, sulfur, thallium, and zinc.

rouvilleite
A monoclinic mineral containing calcium, carbon, fluorine, oxygen, and sodium.

rouxelite
A monoclinic-prismatic black mineral containing antimony, copper, lead, mercury, oxygen, and sulfur.

roweite
An orthorhombic-dipyramidal light brown mineral containing boron, calcium, hydrogen, manganese, and oxygen.

roxbyite
A monoclinic-prismatic bluish black mineral containing copper and sulfur.

ruarsite
A monoclinic-prismatic grayish white mineral containing arsenic, ruthenium, and sulfur.

rubace
Alternative form of rubasse (“form of quartz”).

rubasse
crystalline quartz coloured red by hematite

rubasses
plural of rubasse

rubicel
Alternative form of rubicelle.

rubicelle
An orange-red spinel.

rubicelles
plural of rubicelle

rubicels
plural of rubicel

rubicline
A triclinic-pinacoidal colorless mineral containing aluminum, oxygen, potassium, rubidium, and silicon.

rucklidgeite
A trigonal-hexagonal scalenohedral silver white mineral containing bismuth, lead, and tellurium.

rudenkoite
A monoclinic white mineral containing aluminum, barium, calcium, chlorine, hydrogen, oxygen, silicon, and strontium.

ruitenbergite
A monoclinic-sphenoidal mineral containing boron, calcium, chlorine, hydrogen, and oxygen.

ruizite
A monoclinic-prismatic mineral containing calcium, hydrogen, manganese, oxygen, and silicon.

rusakovite
A monoclinic mineral containing aluminum, hydrogen, iron, oxygen, phosphorus, and vanadium.

russellite
An orthorhombic-pyramidal mineral containing bismuth, oxygen, and tungsten.

rustenburgite
An isometric-hexoctahedral tin white mineral containing palladium, platinum, and tin.

rustumite
A monoclinic-prismatic colorless mineral containing calcium, chlorine, hydrogen, oxygen, and silicon.

ruthenarsenite
An orthorhombic-dipyramidal mineral containing arsenic, nickel, and ruthenium.

rutheniridosmine
A hexagonal-dihexagonal dipyramidal white mineral containing iridium, osmium, and ruthenium.

rutheniridosmines
plural of rutheniridosmine

rutherfordine
An orthorhombic-dipyramidal mineral containing carbon, oxygen, and uranium.

rynersonite
An orthorhombic-dipyramidal mineral containing calcium, niobium, oxygen, and tantalum.

sabatierite
A tetragonal-ditetragonal dipyramidal blue gray mineral containing copper, selenium, and thallium.

sabelliite
A trigonal-rhombohedral emerald green mineral containing antimony, arsenic, copper, hydrogen, oxygen, and zinc.

sabieite
A trigonal-trapezohedral white mineral containing hydrogen, iron, nitrogen, oxygen, and sulfur.

sabinaite
A monoclinic-prismatic mineral containing calcium, carbon, oxygen, sodium, titanium, and zirconium.

sabugalite
A tetragonal-ditetragonal dipyramidal mineral containing aluminum, hydrogen, oxygen, phosphorus, and uranium.

sacrofanite
A hexagonal-dihexagonal dipyramidal colorless mineral containing aluminum, calcium, carbon, chlorine, hydrogen, oxygen, potassium, silicon, sodium, and sulfur.

sadanagaite
A monoclinic mineral containing aluminum, calcium, hydrogen, iron, magnesium, oxygen, potassium, silicon, sodium, and titanium.

saddlebackite
A hexagonal grayish white mineral containing bismuth, lead, sulfur, and tellurium.

safflorite
A mineral consisting of a cobalt arsenite which is part of the lollingite group and usually exists in grayish-white masses.

safflorites
plural of safflorite

sagenite
acicular rutile occurring in reticulated forms embedded in quartz

sagvandite
A form of orthopyroxenite containing bronzite and magnesite.

sagvandites
plural of sagvandite

sahlite
Alternative form of salite.

sahlites
plural of sahlite