Many of the women wore pink sarongs bearing the face of the Pope and Jesus, while others had Pope Benedict's image emblazoned on their T-shirts and baseball caps.
The BBC's Louise Redvers in Luanda says security at Sunday's Mass was extremely tight, but people had still been pulled from the crowd and taken away on stretchers.
On a scorching day, the field gave little shelter from the sun and several people apparently suffered from heat stroke.
'Maelstrom of hatred'
The Pope was said to be "very upset" at the deaths of the two women and began Sunday's Mass by expressing his sadness.
The pontiff was greeted by cheering crowds in Luanda
"I express my solidarity to their families and friends and my deep sorrow because this happened while they were coming to see me."
The pontiff then addressed the crowds about Angola's recent history, particularly the years of civil conflict that followed independence from Portugal in 1975.
He said the suffering of Angolans was shared by many across the continent.
"This experience is all too familiar to Africa as a whole - the destructive power of civil strife, the descent into a maelstrom of hatred and revenge, the squandering of the efforts of generations of good people," he said.
"When God's word... is neglected, and when God's law is ridiculed, despised, laughed at, the result can only be destruction and injustice."
Attack on corruption
Huge crowds have turned out at every opportunity to see Pope Benedict during his stay in Angola, where Catholics account for some 55% of the population.
On Saturday, the Pope urged Catholics in Angola to encourage people "living in fear of spirits" into the Church.
He said Catholics should reach out to those who believed in witchcraft and spirits.
Human rights groups say children in Angola have suffered abuse after being accused of possession by spirits.
Earlier on his trip, the Pope launched a powerful attack on corruption, which analysts say is rife in oil-rich Angola.
The Pope arrived in Angola from Cameroon on Friday.
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