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Downeyite

Collectors Summary

Color farblos
Streak color weiß
Solubility +++ H2O, hygroskopisch!
Crystal System tetragonal, P42/mbc

Chemism

Chem­ical formula

SeO2

Chem­ical com­po­si­tion

Selen, Sauerstoff

Unit weight: 110.96186 u; Number of atoms in the formula: 3

Info

Empirical formula:

SeO2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

28.84

2

66.67

15.9994300

31.9988600

Selenium

Se

71.16

1

33.33

78.9630000

78.9630000

Anal­y­sis wt%

? SeO2 : 99.00

Strunz 9th edi­tion incl. updates

4.DE.05

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
E: Mit mittelgroßen [Kationen]; Mit verschiedenen Polyedern
05:Downeyit-Gruppe

Lapis Clas­sifica­tion

IV/D.14-020

IV: OXIDE
D: Oxide mit Verhältnis Metall : Sauerstoff = 1:2 (MO2 und verwandte Verbindungen)

Clas­sifica­tion by Hölzel

4.DF.160

4: OXIDES
D: Dioxides
F: Ramsdellite-Group

Dana 8th edi­tion

04.04.03.01

04: Oxide Minerals
04: Simple Oxides with a cation charge of 4+ (A++++ O2)

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent

RI value α / ω / n

1.80>

RI value γ / ε

1.80>

2V angle

Uniaxial (+)

Crystallography

Crystal Sys­tem

tetragonal

Class (H-M)

4/mmm

Space Group number

135

Space Group

P42/mbc

Cell param­e­ters a (Å)

8.36

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

5.07

Cell param­e­ters a/b or c/a

0.606

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

8

Volumne (ų)

354.34

X-Ray Pow­der Diffrac­tion

4.180(50),
3.742(60),
3.227(50),
3.008(100),
2.531(20),
1.933(20),
1.883(10),
1.829(10)

XRD chart Downeyite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

4.146

4.16 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ H2O, hygroskopisch!

(Co-)Type locality

(Co-)Type locality

USA/Pennsylvania/Schuylkill Co./Forestville

Preface

Gen­er­a­tion con­di­tions

an "Fumarolen" an brennenden Kohlenhalden

Author (Name, Year)

Finkelman & Mrose, 1977

Addi­tional Informa­tion

extremst hygroskopisch, zerfließt innerhalb von Minuten

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: H301: Giftig bei Verschlucken., H331: Giftig bei Einatmen., H373: Kann die Organe schädigen bei längerer oder wiederholter Exposition., H410: Sehr giftig für Wasserorganismen mit langfristiger Wirkung., P273: Freisetzung in die Umwelt vermeiden., P304+P340: Bei Einatmen: Die Person an die frische Luft bringen und für ungehinderte Atmung sorgen., P309+P310: Bei Exposition oder Unwohlsein: Sofort Giftinformationszentrum oder Arzt anrufen., P314: Bei Unwohlsein ärztlichen Rat einholen / ärztliche Hilfe hinzuziehen.

References

American Mineralogist 62 (1977), 316

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Downeyite

SeO2

tetragonal : 4/mmm : P42/mbc

4.DE.05

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Anatase

TiO2

tetragonal : 4/mmm : I41/amd

IV/D.14-010

Downeyite

SeO2

tetragonal : 4/mmm : P42/mbc

IV/D.14-020

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Ramsdellite

MnO2

orthorhombisch : mmm : Pbnm

4.DF.100

Paramontroseite

VO2

orthorhombisch : mmm : Pbnm

4.DF.110

Anatase

TiO2

tetragonal : 4/mmm : I41/amd

4.DF.130

Downeyite

SeO2

tetragonal : 4/mmm : P42/mbc

4.DF.160

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Rutile

TiO2

tetragonal : 4/mmm : P42/mnm

04.04.01.01

Pyrolusite

MnO2

tetragonal : 4/mmm : P42/mnm

04.04.01.04

Cassiterite

SnO2

tetragonal : 4/mmm : P42/mnm

04.04.01.05

Plattnerite

PbO2

tetragonal : 4/mmm : P42/mnm

04.04.01.06

Argutite

GeO2

tetragonal : 4/mmm : P42/mnm

04.04.01.07

Stishovite

SiO2

tetragonal : 4/mmm : P42/mnm

04.04.01.09

Downeyite

SeO2

tetragonal : 4/mmm : P42/mbc

04.04.03.01

Paratellurite

TeO2

tetragonal : 422 : P43212

04.04.03.02

Anatase

TiO2

tetragonal : 4/mmm : I41/amd

04.04.04.01

Brookite

TiO2

orthorhombisch : mmm : Pbca

04.04.05.01

Tellurite

TeO2

orthorhombisch : mmm : Pbca

04.04.06.01

Scrutinyite

alpha-PbO2

orthorhombisch : mmm : Pbcn

04.04.06.02

Ramsdellite

MnO2

orthorhombisch : mmm : Pbnm

04.04.07.01

Nsutite

(gamma-MnO2)Mnx2+Mn1-x4+O2-2x(OH)2x

04.04.08.01

IMA Number

IMA 1974-063

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Downeyit
Google-Bilder-Suche - search for: Downeyit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Downeyit

English pages

Mindat - search for: Downeyite
Webmineral - search for:Downeyite
Handbook-of-Mineralogy - search for: Downeyite
RRUFF - Raman, XRD and other mineral data - search for: Downeyite
RRUFF - References and PDF downloads - search for: Downeyite
American-Mineralogist-Crystal-Structure-Database - search for: Downeyite
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Russian pages

Webmineral.ru - search for: Доунейит

Mineral Dealer

German pages

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Bosse - search for: Downeyit

Locations with GPS information