Note: Catholic means Universal here. It's about the Orthodox Church. The book was written in the 6th century AD.
The Spiritual Meadow
Chapter XXIX - A miracle of the most holy EUCHARIST
About thirty miles from the city of Aegina in Cilicia there were two stylites about six miles away from each other. One of them belonged to the holy Catholic and Apostolic Church. The other, even though he had been on his column for much longer, followed the wicked teachings of Severian, and in various heretical ways was in the habit of denouncing his Catholic colleague. However, inspired by God, the Catholic asked that a particle of the other's Communion might be sent to him. Overcome with joy, he thought that he had converted the Catholic, and sent it immediately, without hesitation. The Catholic took this particle sent to him by the heretical follower of Severian and put it into a pot of boiling water, where it very soon disintegrated. Then he took the holy Communion of the Catholic church and threw it in. The boiling pot became cool immediately, and the holy Communion remained whole and unblemished. He carefully kept it, and showed it to us when we visited him.
Chapter XXX - The Life of ISODORE a monk of Melitinensis, and another miracle of the most holy EUCHARIST
Dade is the trading centre of Cyprus. There is a monastery there called Philoxene. When we visited it we met a monk from Melitinensis called Isodore. We noticed that he was weeping and groaning unceasingly. People kept on asking him to quieten down a little and moderate his weeping, but he would not.
"I am a greater sinner," he said, "than anyone else since the beginning of time".
"Surely no one is without sin," we said to him, "but God alone."
"Truly, brothers," he replied, "I have never found any sinner like me in the whole human race, no greater sin than mine. And if you really want to know that I am telling the truth, listen to what my sin was, and please pray for me.
"I was a married man when I lived in the world, and we both held to the teachings of Severian. I came home one day to find that my wife was not there, and I was told that she had gone to a woman neighbour who was of the Catholic faith and religion in order to receive Communion. I ran quickly to try and stop her, but when I got to the house I found that she had already communicated. I was mad with rage, and seized her by the throat and made her vomit up the sacred Communion. I picked up the holy particle and threw it away into a dungheap. Shortly afterwards I noticed that that holy Communion had taken on a brilliantly shining appearance. After two days, without a word of a lie, I saw a sort of a half-clothed Ethiopian man (virum quasi Aethiopem semicinctiis vestitum) who said to me: 'You and I are both condemned to an identical punishment.'
"'Who are you, then,' I asked.
"'I am the one who struck the face of him who made us all, the Lord Jesus Christ, during his passion.'
"And this is why I am incapable of moderating my weeping."
Chapter LXXIX - The great and astonishing miracle of the most holy EUCHARIST, in the time of Dionysius the bishop of Seleucia.
When we came to Seleucia we called on abbot Theodore, the bishop of that city. He told us the following story:
This is something that happened under my predecessor, Dionysius of holy memory, bishop of this city. There was a businessman in the city, very rich, and very religious, though a heretic, for he was a follower of Severus. [465-538, Monophysite Patriarch of Antioch]. He had a servant who was a faithful communicant of the holy and apostolic Church, and according to the custom of that province on Maundy Thursday (die Sancto Coenae Dominicae) he received Communion, wrapped it in a fair linen cloth and put it in a safe. It so happened, however, that after Easter this man of faith was sent to Constantinople on business and gave the key of the safe to his master, forgetting that he had left the holy Communion in it.
The master opened the safe one day and found the linen cloth with the holy particles of Communion wrapped up in it. He was worried about this and did not quite know what to do with them. He was reluctant to consume them, seeing that they were of the holy Catholic Church, whereas he was a follower of Severus. So he put them back in the safe, thinking that his servant would consume them when he came back.
But when Maundy Thursday came and the servant had still not come back he thought that perhaps he should burn them, rather than keep them there for a second year. But when he opened the safe he found that the holy particles had germinated, producing stalks and ears of corn. He was overcome with fear and trembling, picked up the holy particles, and together with his whole household shouting Kyrie eleison ran to the holy church, and to the most holy and venerable bishop Dionysius. This great and terrible miracle, exceeding anything that might be thought or reasoned about, or invented, was witnessed not by one or two or three or even several more, but by the whole church, citizens and peasants, natives and visitors, travellers by land and sea, men and women, old men and children, young men and seniors, masters and servants, rich and poor, princes and subjects, wise and foolish, virgins and monks, widows and married women, rulers and ruled. They too shouted Kyrie eleison, though some praised God in other ways, but all truly gave thanks to God for his ineffable miracles. And many who believed because of the miracle were added to the holy Catholic and apostolic Church.
Chapter LXXXVI - Another ANCHORITE from the same monastery, who died immediately after receiving holy Communion
Abba Egiarius told us this story:
I left Aega after the solemnity [not specified] when the winter had become a bit more severe, and came to the monastery of Scopulus. This is what happened when I was there. There was an anchorite living a solitary life in those parts who used to come on Sundays to receive the sacred mysteries. Only once did he cause scandal when for five weeks he stayed away, not coming to the monastery as was his usual custom, which distressed the brothers of the monastery very much. but on the Sunday when I was there he did turn up. The brothers of the monastery were glad to see him, prostrated themselves and asked pardon, as he likewise prostrated himself and asked pardon of them, so restoring charity all round. Then when the anchorite had received the body and blood of our Lord Jesus Christ he went to the middle of the church and fell down dead, even though he had previously shown no sign of any illness. The fathers of the monastery realised that the anchorite had foreseen the day of his death, which is why he had come so that he might pass to the Lord having nothing against anyone.
http://www.monachos.net/library/John_Moschus,_The_Spiritual_Meadow,_Page_1
Are there any Eucharistic miracles documented in the Orthodox church? I've heard that there are..does anyone have any information about this? 
If they are merely bread and wine, nothing should happen to them...ever..
