Laphamite

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Laphamite, etc.

Burnside, Northumberland Co., Pennsylvania, USA

Laphamite, etc.

Burnside, Northumberland Co., Pennsylvania, USA

Laphamite, etc.

Burnside, Northumberland Co., Pennsylvania, USA

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About LaphamiteHide

Davis M. Lapham

Formula:

As₂Se₃

Colour:

dark red

Lustre:

Resinous

Hardness:

1 - 2

Crystal System:

Monoclinic

Name:

Named in honor of Davis M. Lapham (5 May 1931, Glens Falls, New York, USA - 20 December 1974, Harrisburg, Pennsylvania, USA), former Chief Mineralogist of the Pennsylvania Geological Survey. In addition to his technical work, he wrote several collector-friendly publications including 'Mineral Collecting in Pennsylvania'. He was a founding member of the Friends of Mineralogy.

Type Locality:

ⓘ Burnside, Northumberland Co., Pennsylvania, USA

Isostructural with:

Orpiment

The Se analogue of orpiment. Compare kalgoorlieite - the chemical (Te) analogue, but not isostructural with laphamite.

Caveat: Some (or all?) of the photographs showing yellow acicular material might depict Se-bearing orpiment rather than laphamite. (See discussion at https://www.mindat.org/forum.php?read,7,361533,391404#msg-391404 )

Classification of LaphamiteHide

IMA status:

Approved

Approval year:

1985

First published:

1986

Strunz 8th ed.:

2/F.02-80

Nickel-Strunz 10th (pending) ed.:

2.FA.30

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H₂O
A : With As, (Sb), S

Dana 8th ed.:

2.11.6.1

2 : SULFIDES
11 : A_mB_nX_p, with (m+n):p = 2:3

Hey's CIM Ref.:

3.7.10

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
7 : Sulphides etc. of V, As, Sb and Bi

Physical Properties of LaphamiteHide

Lustre:

Resinous

Transparency:

Opaque

Colour:

dark red

Streak:

red-orange

Hardness:

1 - 2 on Mohs scale

Cleavage:

Perfect

Chemical Properties of LaphamiteHide

Formula:

As₂Se₃

Elements listed:

As, Se - search for minerals with similar chemistry

Crystallography of LaphamiteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 11.86 Å, b = 9.75 Å, c = 4.26 Å
β = 90.17°

Ratio:

a:b:c = 1.216 : 1 : 0.437

Unit Cell V:

492.60 Å³ (Calculated from Unit Cell)

Comment:

P2₁/n

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Year	Locality	Temp (K)
0006181	Laphamite	Bindi L, Bonazzi P, Spry P G (2008) Effects of sulfur-for-selenium substitution on the structure of laphamite, As2(Se,S)3 The Canadian Mineralogist 46 269-274	2008	Western Middle Anthracite field, Northumberland County, Pennsylvania	293
0006182	Laphamite	Bindi L, Bonazzi P, Spry P G (2008) Effects of sulfur-for-selenium substitution on the structure of laphamite, As2(Se,S)3 The Canadian Mineralogist 46 269-274	2008	Western Middle Anthracite field, Northumberland County, Pennsylvania	293
0010945	Laphamite	Stergiou A C, Rentzeperis P J (1985) The crystal structure of arsenic selenide, As2Se3 Zeitschrift fur Kristallographie 173 185-191	1985	synthetic	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Laphamite'
loop_
_publ_author_name
'Bindi L'
'Bonazzi P'
'Spry P G'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 46 
_journal_year 2008
_journal_page_first 269
_journal_page_last 274
_publ_section_title
;
 Effects of sulfur-for-selenium substitution on the structure of laphamite, As2(Se,S)3
 Sample: LAP1
;
_database_code_amcsd 0006181
_chemical_compound_source 'Western Middle Anthracite field, Northumberland County, Pennsylvania'
_chemical_formula_sum 'As2.08 Se2.28 S.64'
_cell_length_a 11.891
_cell_length_b 9.742
_cell_length_c 4.274
_cell_angle_alpha 90
_cell_angle_beta 90.03
_cell_angle_gamma 90
_cell_volume 495.109
_exptl_crystal_density_diffrn      4.781
_symmetry_space_group_name_H-M 'P 1 21/n 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
As1   0.26670   0.19510   0.87750   1.00000   0.02600
As2   0.48950   0.32390   0.37350   1.00000   0.02450
SeX1   0.40320   0.11920   0.52090   0.62000   0.02960
SX1   0.40320   0.11920   0.52090   0.36000   0.02960
AsX1   0.40320   0.11920   0.52090   0.02000   0.02960
SeX2   0.34720   0.40920   0.02100   0.78000   0.02760
SX2   0.34720   0.40920   0.02100   0.19000   0.02760
AsX2   0.34720   0.40920   0.02100   0.03000   0.02760
SeX3   0.12320   0.30000   0.55010   0.88000   0.02560
SX3   0.12320   0.30000   0.55010   0.09000   0.02560
AsX3   0.12320   0.30000   0.55010   0.03000   0.02560
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
As1 0.01810 0.03610 0.02370 -0.00160 -0.00250 0.00350
As2 0.01690 0.03450 0.02210 -0.00080 -0.00010 -0.00090
SeX1 0.02080 0.03800 0.03000 0.00060 -0.00030 0.00010
SX1 0.02080 0.03800 0.03000 0.00060 -0.00030 0.00010
AsX1 0.02080 0.03800 0.03000 0.00060 -0.00030 0.00010
SeX2 0.02080 0.03600 0.02610 0.00180 -0.00330 0.00130
SX2 0.02080 0.03600 0.02610 0.00180 -0.00330 0.00130
AsX2 0.02080 0.03600 0.02610 0.00180 -0.00330 0.00130
SeX3 0.01560 0.03900 0.02250 0.00100 -0.00320 0.00070
SX3 0.01560 0.03900 0.02250 0.00100 -0.00320 0.00070
AsX3 0.01560 0.03900 0.02250 0.00100 -0.00320 0.00070

Type Occurrence of LaphamiteHide

Type Locality:

ⓘ Burnside, Northumberland Co., Pennsylvania, USA

Place of Conservation of Type Material:

The Natural History Museum, London, England, 1984,843 and E.1036.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 163039.

Geological Setting of Type Material:

Secondary mineral formed, probably by sublimation, on a clinker adjacent to a surface vent on a burning pile of coal.

Reference:

Dunn, P.J., Peacor, D.R., Criddle, A.J., Finkelman, R.B. (1986) Laphamite, an arsenic selenide analogue of orpiment, from burning anthracite deposits in Pennsylvania. Mineralogical Magazine: 50: 279-282.

Download:

http://rruff.info/rruff_1.0/uploads/MM50_279.pdf

Synonyms of LaphamiteHide

IMA1985-021

Other Language Names for LaphamiteHide

German:Laphamit

Japanese:セレン石黄
ラップハム石

Russian:Лафамит

Spanish:Laphamita

Common AssociatesHide

Associated Minerals Based on Photo Data:

2 photos of Laphamite associated with Orpiment

As₂S₃

Related Minerals - Nickel-Strunz Grouping Hide

2.FA.	Anorpiment	As₂S₃	Tric. 1 : P1
2.FA.	Bonazziite	As₄S₄	Mon. 2/m : B2/b
2.FA.05	Duranusite	As₄S	Orth. mmm (2/m 2/m 2/m) : Pmna
2.FA.10	Dimorphite	As₄S₃	Orth. mmm (2/m 2/m 2/m) : Pnma
2.FA.15b	Pararealgar	As₄S₄	Mon. 2/m : P2₁/b
2.FA.15a	Realgar	As₄S₄	Mon. 2/m
2.FA.15d	UM1970-18-S:As	As₄S₄	Mon. 2/m : B2/b
2.FA.20	Alacránite	As₈S₉	Mon. 2/m : P2/b
2.FA.25	Uzonite	As₄S₅	Mon.
2.FA.30	Orpiment	As₂S₃	Mon. 2/m
2.FA.35	Getchellite	AsSbS₃	Mon. 2/m : P2₁/b
2.FA.40	Wakabayashilite	[(As,Sb)₆S₉][As₄S₅]	Orth. mm2 : Pna2₁

Related Minerals - Hey's Chemical Index of Minerals Grouping Hide

3.7.1	Patrónite	VS₄	Mon.
3.7.2	Duranusite	As₄S	Orth. mmm (2/m 2/m 2/m) : Pmna
3.7.3	Dimorphite	As₄S₃	Orth. mmm (2/m 2/m 2/m) : Pnma
3.7.4	Realgar	As₄S₄	Mon. 2/m
3.7.5	Pararealgar	As₄S₄	Mon. 2/m : P2₁/b
3.7.6	Alacránite	As₈S₉	Mon. 2/m : P2/b
3.7.7	Uzonite	As₄S₅	Mon.
3.7.8	Orpiment	As₂S₃	Mon. 2/m
3.7.9	Jeromite		Amor.
3.7.11	Getchellite	AsSbS₃	Mon. 2/m : P2₁/b
3.7.12	Wakabayashilite	[(As,Sb)₆S₉][As₄S₅]	Orth. mm2 : Pna2₁
3.7.13	Pääkkönenite	Sb₂AsS₂	Mon. 2/m : B2/m
3.7.14	Stibnite	Sb₂S₃	Orth. mmm (2/m 2/m 2/m)
3.7.15	Metastibnite	Sb₂S₃	Amor.
3.7.16	Tellurantimony	Sb₂Te₃	Trig.
3.7.17	Bismuthinite	Bi₂S₃	Orth. mmm (2/m 2/m 2/m)
3.7.18	Nevskite	Bi(Se,S)	Trig.
3.7.19	Guanajuatite	Bi₂Se₃	Orth. mmm (2/m 2/m 2/m) : Pnma
3.7.21	Ikunolite	Bi₄(S,Se)₃	Trig.
3.7.22	Laitakarite	Bi₄Se₂S	Trig. 3m : R3m
3.7.23	Poubaite	PbBi₂(Se,Te,S)₄	Trig.
3.7.24	Tellurobismuthite	Bi₂Te₃	Trig.
3.7.25	Součekite	PbCuBi(S,Se)₃	Orth.
3.7.26	Tsumoite	BiTe	Trig. 3m (3 2/m) : P3 1m
3.7.27	Pilsenite	Bi₄Te₃	Trig. 3m (3 2/m) : R3m
3.7.28	Hedleyite	Bi₇Te₃	Trig. 3m (3 2/m) : R3m
3.7.29	Tetradymite	Bi₂Te₂S	Trig. 3m (3 2/m) : R3m
3.7.30	Joséite	Bi₄TeS₂	Trig. 3m (3 2/m) : R3m
3.7.31	Joséite-B	Bi₄Te₂S	Trig. 3m (3 2/m) : R3m
3.7.32	Ingodite	Bi₂TeS	Trig.
3.7.33	Sulphotsumoite	Bi₃Te₂S	Trig.
3.7.34	Kawazulite	Bi₂Te₂Se	Trig.
3.7.36	Skippenite	Bi₂TeSe₂	Trig.
3.7.37	Kochkarite	PbBi₄Te₇	Trig.
3.7.38	Rucklidgeite	PbBi₂Te₄	Trig.
3.7.39	Aleksite	PbBi₂Te₂S₂	Trig.
3.7.40	Junoite	Cu₂Pb₃Bi₈(S,Se)₁₆	Mon. 2/m : B2/m

Other InformationHide

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for LaphamiteHide

Reference List:

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)

Kirkinskii, V.A., Yakushev, V.G. (1968) A new polymorphic modification of arsenic selenide obtained at high pressures (in English). Doklady Chemistry: 182: 896-898.

Kirkinskii, V.A., Yakushev, V.G. (1968) A new polymorphic modification of arsenic selenide obtained at high pressures (in Russian). Doklady Akademii Nauk SSSR: 182: 1083-1086.

Kirkinskii, V.A., Ryaposov, A.P., Yakushev, V.G. (1970) Synthesis of a third polymorphic modification of arsenic selenide at high pressure. Soviet Physics Solid State, USSR: 11: 1923-1924.

Zallen, R., Slade, M.L., Ward, A.T. (1971) Lattice vibrations and interlayer interactions in crystalline As2S3 and As2Se3. Physical Review B: 3: 4257-4273.

Stergiou, A.C., Rentzeperis, P.J. (1986) The crystal structure of arsenic selenide, As2Se3. Zeitschrift für Kristallographie: 173: 185–191.

Hawthorne, F.C., Jambor, J.L., Bladh, K.W., Burke, E.A.J., Grice, J.D., Phillips, D., Roberts, A.C., Schedler, R.A., Shigley, J.E. (1987) New mineral names. American Mineralogist: 72: 1023-1028.

Bindi, L., Bonazzi, P., Spry, P.G. (2008) Effects of sulfur-for-selenium substitution on the structure of laphamite, As2(Se,S)3. The Canadian Mineralogist: 46: 269-274.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for LaphamiteHide

mindat.org URL:

https://www.mindat.org/min-2328.html
Please feel free to link to this page.

Search Engines:

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External Links:

Look for Laphamite on Webmineral

Look for Laphamite on Wikipedia

Look for Laphamite on Mineralien Atlas

Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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Localities for LaphamiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.

USA (TL)