RECORD: Darwin, C. R. n.d. Geological specimens numbered 938-964, with descriptions. CUL-DAR39.94. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 9.2022. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.


[94]

975 — Feldspathic rock n of Orange Bay)

a b c} 0 varieties of Slate

E 938 Amphibolic rock Hornblende in long log crystals- somehow nearly 3 inch white feldspar & green [illeg] mineral

F 939 Same Hornblende & feldspar in smaller crystals

G 940 Finer grained greenstone hornbl light crystal

H 941 Slate semi-sown hard — reddish to be somewhat [word excised?] scale of mica

K 942 fine grained compact dark blue grey slate — slightly conchoidal fracture small pigments speck of Pyrites

L 943 Greenstone in Hornbl in lighter cry

M 944 Feldspathic rock / easily fusible bluest gres with specks of pyrites angular cleavage irregular fracture — Consider spec. gravity

N 945 Feldspathic rock with small crystal of do — pale greenish grey.— speck of mica  pyrites & angular frag bits of slate (same as 942 / easily fusible in pale glass with black specks, slightly slaty fracture

O — same as in (942)

P 946 Same as 945 mica of slate much larger & are [illeg] apparent [illeg] in smaller pieces edges of slate blended with Feldspathic all the rock describe as greenish [illeg] as same as this except

Q 947 in white feldspar in large crystals & rock although more crystalline & paler coloured—

948 Slate divided into laminæ — & much ferruginous matter

R — same as (945)

S 949 Eunili [illeg] cryst small beds layer of quartz & layer of quartz — melts easily

950 do passing into [illeg] feldspar discernable layers of mica

[94v]

T — ? ?

V 951 Chlorite greenish micaceous slate where individual constitution are lost — The spec from where the mica slate format common 

W 952 Mica slate curved layer of quartz separate scale of Mica — described garnets

X 953 Greenish almost composed of mineral acicular crystal of Hornblende; melting cause black glass with bubbling—

Y — same as (949)

Z 954 Micaceous slate in which Mica (or Fels?) envelope the quartz with pale uniform glassy coat

955 Greenish fine grained Hornblende slate-Hornblende in acicular [illeg] crystals

956 Granite — Quartz large crystal — Feldspar dead white mica not abound — dark green.

957 Granitic rock – constituents very irregular qu feldspar rath but little crystals – little mica green mineral

958 Hornblende slate

959 Imperfect gneiss — Mica not developed

960 Granitic-mica-black, with Hornblende feldspar white-crystal not large—

961 Hornblendic-slate fine grained

962 Syenite — small grained, hornble not more crystallize

963 Syenite – (hornbl same as do) Feldspar largest crystal – quartz sparing

964 Slate (roofing) with most minute specks of pyrites


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

File last updated 25 September, 2022