Table 1.  Average mineral compositions in ALH 84001.


    opx
n = 204*
±1
sigma
cpx
n = 2
±1
sigma
msk
n = 44
±1
sigma
cm
n = 103
±1
sigma
apat
n = 12
±1
sigma
carb
n = 42
±1
sigma
SiO2  54.00.5 53.20.1 61.91.8 - - - - 0.110.22
TiO2  0.150.02 0.360.01 --2.23 0.36-- --
Al2O3  0.640.09 0.720.02 24.71.3 8.530.51 ----
Cr2O3  0.400.13 0.800.07 --47.7 2.4-- 0.040.07
Fe2O3**  ---- --7.69 1.25-- --
V2O3  ---- --0.64 0.06-- --
FeO  17.70.3 7.930.07 0.290.09 29.10.7 0.780.08 21.94.2
MnO  0.490.01 0.290.01 --0.39 0.020.03 0.010.79 0.63
MgO  25.20.4 15.80.3 0.050.03 3.850.30 3.380.06 24.25.1
CaO  1.660.20 20.60.02 6.291.13 0.020.02 49.20.06 6.651.90
Na2O  0.030.01 0.400.03 7.070.39 --2.23 0.120.33 0.07
K2O  ---- 0.970.58 --0.09 0.01--
P2O5  ---- ---- 44.80.3 0.040.02
sum  100.24  99.77  101.27  100.16  100.51  100.03*** 
mg#  71.7- 78.0- -- 19.188.5 66.3-- -
cr#  ---- --70.4 ---- -
  Wo 3.3- 42.2An 31.1-- --Cc 11.5-
  En 69.4- 45.1Ab 63.2-- --Mg 58.0-
  Fs 27.3- 12.7Or 5.7-- --Sd 29.4-
  ---- ---- --Rd 1.1-

*Na2O based on 130 analyses only. **Fe2O3 calculated after Carmichael (1967). ***Sum includes CO2 calculated assuming stoichiometry.