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Here are the incorrect Guesses at GameFaqs

Just add to that any guesses that were made on this topic

Ancient Machine,
Bahamut Zero Materia,
Bugenhagen,
Bugenhagen’s Machine,
Buster Sword,
Buster Sword’s Shadow on New Game Screen,
Chaos Lv.4 Limit,
Cloud & Zack’s Stasis Tubes,
Cloud’s Coma,
Cloud's Conscience,
Cloud's Promise Flashback,
Corel Reactor,
Corel Runaway Train,
Diamond Weapon,
Enemy Skill Materia,
FFVII Comet Logo,
FFVII Game Case,
Forgotten City Waterfall,
Game Disc FFVII,
Gi Cave Entrance Panel,
Gold Chocobo,
Gravity Materia,
Green Chocobo,
Guidebook,
Holy Materia,
Insert Next Disc Screen,
Instructions Booklet,
Invisible Ink in Shinra Mansion,
Jenova’s Head,
Jenova's Containment Vessel,
Kalm Flashback Dragon,
Key of the Ancients,
Keystone,
Large Frog at Ancient Forest,
Leviathan Scales,
Library in the Shinra Mansion,
Lifestream,
Lost Number,
Lucrecia,Waterfall Cavern,
Lucrecia’s Stone Altar,
Mako Eyes,
Mako Reactor 12,
Manhole Bestiary,
Masamune,
Mega-All Materia
Memory Card,
Memory Slot 1,
Memory Slot 2,
Meteor Materia,
Midgar Zolom,
Missing Score,
Mt.Nibel Reactor,
Nibelheim Flashback,
Opening Credits Background Images,
Photo at Nibelheim
Playstation Logo,
Professor Gast's Recordings,
Proud Clod,
PS Controller,
Red Triangle Position Markers,
Rocks in the Gi Cave,
Ruby Weapon,
Sapphire Weapon,
Save Point,
Scene with Tifa in the Gas Chamber,
Sector 6 Sephiroth Clone,
Shadow Flare,
Shinra Mansion Library,
Shinra Mansion Piano,
Speed Square UFO,
Steal as Well Materia,
Submarine,
Sunken Gelnika,
Temple of the Ancients Pond,
Texas Beer Sign,
The Forgotten City,
The Meteor Comet,
The Real Sephiroth,
The Sister Ray,
The Sleeping Forest,
Tifa's Piano,
TV Broadcast,
Ultimate Weapon,
Underwater Reactor,
White Gloved Hand,
World Map,
Zack,

you see it twice..
it's in the shadows..
it reveals a place i will go..
also it shows a glimpse of long lost foe..
what am i...

..black materia

or midgar zolom..

Riddle: "Unless it's given, you can never take it,
As the name says, this is something sacred,
But don't worry, keep your eye on the sky,
Just space out, then give it another try,
What am I?"

The Black Materia

Unless its given, it cannot be taken. Sephiroth disquised himself as Tifa so Red XIII would give the materia to him. And keep an eye in the sky for Meteor, spacing out?

It has to be an item or object dued to the riddle asking What am I.
And the Unless it's given, you can never take it one has been solved, it's on page six.

What are Papers on Tifa's Desk? You see them twice story wise and each time they say something different. But are revealing info when read each time. And technicially her house appears to be in the shadows.

question 1

I think its Sephiroth