Rhodonite

Rhodonite is a manganese inosilicate, (Mn, Fe, Mg, Ca)SiO 3 and member of the pyroxenoid group of minerals, crystallizing in the triclinic system.wikipedia
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Triclinic crystal system

triclinicpinacoidtriclinic crystals
Rhodonite is a manganese inosilicate, (Mn, Fe, Mg, Ca)SiO 3 and member of the pyroxenoid group of minerals, crystallizing in the triclinic system.
Mineral examples include plagioclase, microcline, rhodonite, turquoise, wollastonite and amblygonite, all in triclinic normal.

Bustamite

The manganese is often partly replaced by iron, magnesium, calcium, and sometimes zinc, which may sometimes be present in considerable amounts; a greyish-brown variety containing as much as 20% of calcium oxide is called bustamite; fowlerite is a zinciferous variety containing 7% of zinc oxide.
Bustamite could be confused with light-colored rhodonite or pyroxmangite, but both these minerals are biaxial whereas bustamite is biaxial .

Pyroxmangite

The rare polymorph pyroxmangite, formed at different conditions of pressure and temperature, has the same chemical composition but a repeat unit of seven tetrahedra.
It is the high-pressure, low-temperature dimorph of rhodonite.

List of Massachusetts state symbols

Commonwealth of MassachusettsList of symbols of the Commonwealth of MassachusettsMassachusetts
Rhodonite is the official gemstone of the Commonwealth of Massachusetts.

Khondalite

Khondalite is quartz–manganese-rich garnet–rhodonite schist.

Silicate minerals

silicate mineralphyllosilicatephyllosilicates
Rhodonite is a manganese inosilicate, (Mn, Fe, Mg, Ca)SiO 3 and member of the pyroxenoid group of minerals, crystallizing in the triclinic system. The inosilicate (chain silicate) structure of rhodonite has a repeat unit of five silica tetrahedra.

Wollastonite

WoCalcium metasilicateCaSiO 3
In some cases, small amounts of iron (Fe), and manganese (Mn), and lesser amounts of magnesium (Mg) substitute for calcium (Ca) in the mineral formula (e.g., rhodonite).

Manganese

Mnmanganese oreMn 2+
Rhodonite is a manganese inosilicate, (Mn, Fe, Mg, Ca)SiO 3 and member of the pyroxenoid group of minerals, crystallizing in the triclinic system. The manganese is often partly replaced by iron, magnesium, calcium, and sometimes zinc, which may sometimes be present in considerable amounts; a greyish-brown variety containing as much as 20% of calcium oxide is called bustamite; fowlerite is a zinciferous variety containing 7% of zinc oxide.

Mineral

mineralsmineral depositsaccessory mineral
Rhodonite is a manganese inosilicate, (Mn, Fe, Mg, Ca)SiO 3 and member of the pyroxenoid group of minerals, crystallizing in the triclinic system.

Redox

oxidationoxidizedreduction
It commonly occurs as cleavable to compact masses with a rose-red color (the name comes from the Greek ῥόδος rhodos, rosy), often tending to brown because of surface oxidation.

Crystal

crystallinecrystalscrystalline solid
Rhodonite crystals often have a thick tabular habit, but are rare.

Crystal habit

habitMassivetabular
Rhodonite crystals often have a thick tabular habit, but are rare.

Cleavage (crystal)

cleavagecleavagescleavage plane
It has a perfect, prismatic cleavage, almost at right angles.

Mohs scale of mineral hardness

Mohs hardnessMohs scalehardness
The hardness is 5.5–6.5, and the specific gravity is 3.4–3.7; luster is vitreous, being less frequently pearly on cleavage surfaces.

Specific gravity

specific gravitiessgdensities
The hardness is 5.5–6.5, and the specific gravity is 3.4–3.7; luster is vitreous, being less frequently pearly on cleavage surfaces.

Lustre (mineralogy)

lusterlustrevitreous
The hardness is 5.5–6.5, and the specific gravity is 3.4–3.7; luster is vitreous, being less frequently pearly on cleavage surfaces.

Iron

FeFe 2+ Fe(III)
The manganese is often partly replaced by iron, magnesium, calcium, and sometimes zinc, which may sometimes be present in considerable amounts; a greyish-brown variety containing as much as 20% of calcium oxide is called bustamite; fowlerite is a zinciferous variety containing 7% of zinc oxide.

Magnesium

MgMg 2+ Mg2+
The manganese is often partly replaced by iron, magnesium, calcium, and sometimes zinc, which may sometimes be present in considerable amounts; a greyish-brown variety containing as much as 20% of calcium oxide is called bustamite; fowlerite is a zinciferous variety containing 7% of zinc oxide.

Calcium

CaCa 2+ calcium ions
The manganese is often partly replaced by iron, magnesium, calcium, and sometimes zinc, which may sometimes be present in considerable amounts; a greyish-brown variety containing as much as 20% of calcium oxide is called bustamite; fowlerite is a zinciferous variety containing 7% of zinc oxide.

Zinc

ZnZn 2+ zinc alloy
The manganese is often partly replaced by iron, magnesium, calcium, and sometimes zinc, which may sometimes be present in considerable amounts; a greyish-brown variety containing as much as 20% of calcium oxide is called bustamite; fowlerite is a zinciferous variety containing 7% of zinc oxide.

Tetrahedron

tetrahedraltetrahedra{3,3}
The inosilicate (chain silicate) structure of rhodonite has a repeat unit of five silica tetrahedra.

Polymorphism (materials science)

polymorphpolymorphspolymorphism
The rare polymorph pyroxmangite, formed at different conditions of pressure and temperature, has the same chemical composition but a repeat unit of seven tetrahedra.

Filipstad

In the iron and manganese mines at Pajsberg near Filipstad and Långban in Värmland, Sweden, small brilliant and translucent crystals (pajsbergite) and cleavage masses occur.

Långban

LangbanLångbanshyttan
In the iron and manganese mines at Pajsberg near Filipstad and Långban in Värmland, Sweden, small brilliant and translucent crystals (pajsbergite) and cleavage masses occur.

Värmland

VarmlandVermlandProvince of Värmland
In the iron and manganese mines at Pajsberg near Filipstad and Långban in Värmland, Sweden, small brilliant and translucent crystals (pajsbergite) and cleavage masses occur.